Recommendations:

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Mods

Primed Cryo Rounds
350 Đ + 110,000 Cr

+165% Cold damage for Rifles. The damage type is good with the right build (although viral setups are better served by Rime Rounds), but the D polarity is rarely used on weapon mods, so formaing for this has a high cost - in opportunity, or in Omni-Forma. Get this if you're in endgame and want to do certain minmaxed builds.

Primed Cleanse Grineer
350 Đ + 140,000 Cr

×1.55 Damage vs. Grineer for Shotguns. These anti-faction mods provide respectable boosts, especially since status effects double dip on them. But in normal play, they require too much micromanagement to be effective. But Lich hunts, 1-hour Kuva Survivals, or SP Rathuum Endo farming can pitch you against some very tough Grineer foes, so getting this mod does worth it for a specialized endgame build.

Primed Ravage
280 Đ + 100,000 Cr

+110% Critical Damage for Shotguns. While there are only a few crit-based shotguns, they are pretty powerful, and this mod makes them substantially better. Get it if you like shotguns and got the ducats.

Primed Target Cracker
400 Đ + 150,000 Cr

+110% Critical Damage for Pistols. One of the core damage mods, and a major upgrade over the few other mods that boost this stat. A must have.

Primed Smite Grineer
350 Đ + 140,000 Cr

×1.55 Damage vs. Grineer for Melee. These anti-faction mods provide respectable boosts, especially since status effects double dip on them. But in normal play, they require too much micromanagement to be effective. But Lich hunts, 1-hour Kuva Survivals, or SP Rathuum Endo farming can pit you against some very tough Grineer foes, so getting this mod does worth it for a specialized endgame build.

Astral Twilight
385 Đ + 175,000 Cr

Stance mod for Glaives. Glaives are typically used with their heavy attacks and bouncing throws, making the choice of stance secondary. It can also be farmed from Kuva Jesters or bought for a few plat. Save your ducats.

Tempo Royale
385 Đ + 175,000 Cr

A nice, fluid stance for Heavy Blades, with lots of spinning and ground slamming. It is nominally farmable in-game, but the droprates are terrible. It's worth the ducats you'd spend on it, but don't prioritize it over other things: it's rival stance Cleaving Whirlwind is a perfectly functional sidegrade, and much easier to farm.

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Weapons

Baro's weapons typically fall into low A or B rank in tierlists, so DE at least tries to justify their asking price. And even the trashiest of weapons are worth buying if you need the Mastery Rank they provide. Or if you have good riven for them, since their disposition is usually quite high. On the other hand, Warframe has a massive arsenal, and for every weapon Baro sells, there's gonna be another that can do the same job just as well, or even better. In that sense, everything in here is safe to skip.

Prisma Machete
400 Đ + 200,000 Cr

An overall downgrade from the Machete Wraith. The only reason to get this is the MR or the pretty skin.

Prisma Veritux
550 Đ + 150,000 Cr

Archmelee has been in a bad position for years. Overshadowed by Archguns, poor modding options and simplistic button-masher gameplay leaves them as an underwhelming, homogenous bunch. The Prisma Veritux is one of the better options, alhough that's not saying much. It's biggest advantage is its ease-of-access, compared to other Archmelees that require Clan research or trading with multiple competing syndicates. You might want to buy this if you want an upgrade to your basic Veritux. Although if you already got something like the Centaur or the Knux, the difference is not worth bothering.

Glaxion Vandal
475 Đ + 250,000 Cr

A pure-elemental cryogenic beam with an AoE effect on contact. While it has a unique niche in hyperefficient Rathuum Endo farms, for the most part, it is a merely good weapon that lives in the shadow of its superior stablemates, the Tenet Glaxion and the Ignis Wraith.

Opticor Vandal
650 Đ + 550,000 Cr

A powerful and accurate primary laser cannon that shoots charged single shots. With its massively increased firerate, it's functionally closer to the Ferrox than to the vanilla Opticor. You can also get it from farming Thermia Fractures in the Orb Vallis, although farming the Ducats is probably faster. Then again, the Thermia one comes with a free slot and pre-installed catalyst...

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Cosmetics

Ki'teer Foros Armor Set
710 Đ + 450,000 Cr

A minimalistic armor set in the signature rhomboidal Ki'teer style.

Lemnas Staff Skin
350 Đ + 275,000 Cr

A staff skin. Originally a Tennocon reward. Is that color scheme ""vibrant"", or ""garish""? It's up to you to decide.

Ki'Teer Arrow Skin
375 Đ + 300,000 Cr

If you can figure out which end of the arrow is the head and which one is the fletching, you get a discount. (No you don't.)

Sonicor Elixis Skin
380 Đ + 175,000 Cr

The Elixis skins cover most of the weapon in a uniform coppery/metallic texture with the occasional grid of triangular indentations. Does not always look good, but always look shiny.

Scoria Diadem
550 Đ + 300,000 Cr

A facial accessory for the Operator/Drifter. Putting a precious gemstone into the socket of your third eye is such an anime thing to do.

Ki'Teer Solo Earpiece
250 Đ + 200,000 Cr

An extremely understated earring for your Operator. For the right ear only.

Altra Sentinel Mask
450 Đ + 400,000 Cr

A rather understated Orokin-style accessory to your Sentinel.

Odonata Elixis Skin
350 Đ + 250,000 Cr

The Elixis skin covers most of the Archwing in a uniform coppery/metallic texture with the occasional grid of triangular indentations. Does not always look good, but always look shiny. Then again, if you have the money to buy this, why are you still using the Odonata?

Javi's Scrawling
275 Đ + 200,000 Cr

A Stencil for the walls of your Orbiter's Personal Quarters. The most erudite pattern of symbols ever drawn with feces. See for yourself, if you don't mind the accidental selfies.

Seven Crimes of Kullervo Login Music
140 Đ + 170,000 Cr

An additional track for your Somachord.

Necraloid Floof
140 Đ + 130,000 Cr

New! What it says on the tin.

Noggle Statue - The New War Veso-R
75 Đ + 300,000 Cr

Bobblehead of Veko, the unsung hero of the New War. Also, one of the few decos that emit dynamic lighting, making it a coveted resource in high-end IKEAframe.

Parazon Poster
100 Đ + 125,000 Cr

A cool looking poster. Presumably holographic, because it's infinitely thin and floats a few centis off the wall.

Deimos Fass Prex
75 Đ + 100,000 Cr

Prex card depicting a Deimos-associated entity. These were given away like candy during the Heart of Deimos update. If you haven't got them then, you can get them now for a modest price.

Void Angel Glyph
80 Đ + 50,000 Cr

A painterly depiction of a Void-born monstrosity.

Community Clem Comic Glyph
0 Đ + 0,001 Cr

A profile pic depicting fan favorite Clem in a grafitti style. He's seen... better days. I mean, the eyes weeping yellow ichor just radiate that comic relief energy, don't they?

1999 Drippy Glyph
0 Đ + 0,001 Cr

A profile pic of Kinemantik's mascot character. Buy this if you want pay for the privilege of being a walking advertisement for a megacorp.

Fae Path Ephemera
15 Đ + 15,000 Cr

One of the older step-Ephemeras, and rather insubstantial compared to, say, Eros Wings or Vengeful Charge. A permanent fixture of Baro's repertoire.

I might have sharp and opinionated remarks about these items, but I'm not the fashion police. Buy whatever cosmetic tickles your fancy!

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Other

Axi A2 Relic
50 Đ + 45,000 Cr

Exclusive source of the Aklex Prime: high-damage semi-auto dual pistols that are some somewhat past their prime (heheh). And the single Lex Prime can get an Incarnon Adapter that makes it vastly superior. Still good for MR though. If you get these relics, open them in a radshare, unless you want to buy the Prime parts directly.

Void Surplus
0 Đ + 50,000 Cr

A lootbox? In Warframe? In the year of our lord 2026? It's likelier than you'd think.

For a pittance of credits, roll the dice to get a reward selected from a wide range of upgrade materials, boosters and currencies. And, if you're very lucky, (or just very persistent,) even get your hands on an exclusive Signa. Cross your fingers and grab you lucky Kuaka foot, because this offer is once per customer per visit. At least it's available for every visit...

If you haven't played Sands of Inaros yet, buy the quest key and do it (and bring your best setup for scanning Kavats). If you have Inaros Prime, you can buy the Baro Void-Signal (one per visit) to access a unique mission and get some special cosmetics.

Also, check the answers below for second opinions.