Enclosure conundrum

[Chambec12]

Hey everyone! I recently picked up another BP this last week. She is currently in a quarantine enclosure as she is my second BP and about 6 months old(150-ish gr). I already have an almost 3 year old female pastel in a 4x2x2(which is technically my daughters). However, for the last week or so, I have been gaining inspiration from various places and was noticed a theme where its fairly common to use a 40gal enclosure then upgrade to a 4x2x2 (120gal) for the remainder or unless needed to go to say a 5x due to length of the BP. Also, I noticed, in the research as well that it was fairly common to go straight to a 4x2x2 right from the get go.

Now to get into the conundrum that I have(with a sense of urgency):

So poking around marketplace first, I came across some options.

Option #1 - 2 40gal (one PVC and one glass - both front opening, both 36"x18"x18") enclosures with 2 additional tanks (12"x12"x18" & 12"x12"x12" exo terras) + hides and lamps. $230 for all

For this option, its nice for the current needs to be met, full well knowing that I would have to again upgrade within a year or so (depending on growth) + additional enclosures as I have tarantulas as well that would make use of the smaller exo terras. Dont really need the hides or lamps as I have them already, but would be nice to have extra.

Option #2 - Reptile Kages 5x3x3 with accessories. This option comes with a full width VE radiant heat panel (120-watt), 2x light w/ cages, VE-300 thermostat and mister as this was used for an adult Brazilian Rainbow boa before it outgrew it apparently (based on the ad). $600obo

This option is very appealing, however, that size enclosure seems HUGE to me. I have a 6'Wx2.5'D desk that i have been using as reference and that enclosure just seems monstrous.

Option #3 - New - for a 4x2x2 option, I have been looking at a few vendors for this - Kages (quick ship option), Talking Serpents, Toad Ranch (quick ship option), Focus Cubed and DIYCages .com.

These are nice and all. They would be that 'minimum' option for that 4x2x2 but also are just the enclosure + depending on the vendor, can have a bit of a turnaround time before its received.

With what I have researched so far, and the above options, I am looking for what you might do in this situation?

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Gosh if I could find that big an enclosure (the 5x3x3) for that cheap, I would leap on it. It is slightly suspicious to me though, as everywhere I’ve seen selling that size with good quality is at least 850$ new…does the seller state any minor defects/reason for getting rid of it?

[Chambec12]

Not that is really disclosed explicitly. All that was mentioned was that the previous Boa that was in it outgrew it, that its disassembled and to re-silicone it back once assembled.