M38s are some of the most uncommon, I see very few of them anymore, I’ll probably never let mine go, if you ever decide to sell shoot me a message.
91/30s are still fairly abundant, although the current attitude on private listing sights for just about anything has dictated they’re worth more than they should be, in January you could buy one for $350 off a legitimate retailer, since then I’ve seen them hit the $450 mark easily already. If it’s hex or SA/Finnish it’s worth money and getting very rare.
M44s are a laughable market for me these days, I’ve seen people asking excess of $1000 for a common M44 in decent but by no means collector quality. I sold mine during the lockdown for by what anyone should consider a pretty penny, although I wish I didn’t now, like a lot of people will point out they aren’t making any more of these. I would consider this or the 91/30 the one to sell/trade if it were me. The M44 just because between all the years it was made, and the Chinese variants, you’ll always see these around but for some reason the price acts like they’re rare.