Its all about supply and demand. I'd have to agree with RP88 : Garands, Mosin Nagants of all kinds, M1 Carbines, K31s, K/M98s, SKS's, Swede Mausers, Lee Enfields, etc. especially with the political turmoil going on.
I know a guy right now who can't get what he paid for a bunch of 7.62x39...