I would wait till after march 31st to buy used, alot of states keep seasons open that long, at least on beaver, and if they are still running steal for beavs, they aren't going to want to sort out yote traps.
+1 on Murrays, I have bought traps from them before, and they are great ppl!
Trapperman.com is a great trapping forum, the ppl there are always willing to help.