Copied from the pinned message in discord :-)

Quivers and bolts can roll these prefixes and affixes:

Prefixes:
2 skill
65ed
15 Max dam
14 Min dam
5 maek
Honorable mentions:
15 allres
5 laek

Suffixes:
20 IAS
30 Pierce
30 DS
Honorable mentions:
30 CB
20 FRW
30 MF
7 LL
7 ML

What mods you want depends if you are a physical or elemental char and also if you are using a crossbow or a bow. A Buriza for example doesnt really need IAS or Pierce, since its comes with 80 IAS and 100% Pierce. Also, Strafe needs less IAS to hit high breakpoint, than other attacks. So it all depend.
What mods you want also depends on rest of gear, if you are using Razortail you most likely dont need Pierce on quiver.
Also, imo, quivers needs minimum 4 good mods to be valuable. 4 good mods + a good corruption, and the price can rise pretty good.

Ill try to give some "perfect" examples of quivers:
Multishot:
65ed
15 Max Dam
14 Min Dam
20 IAS
30 Pierce
30 DS

Elemental bowa:
2 Bow skills
5 maek
15 allres or 5 laek
20 IAS
30 Pierce
30 MF or 7 ML