Gunbroker, Guns international,Guns America,Auction Arms, Cabelas, Dave Riffle. Right now Riffle has one NIB Y for $2900+. Auction arms has a pre 64 NIB for $2600. I bought a 95% Pigeon off this site 2 years ago for less than half that.
I check the auction sites daily, I am a beginning collector and am always looking for a good buy...There are a few Y models for "sale" at high prices, but there is usually something special about them...NIB, Mod. choke, skeet, but I don't see any of them selling. There are also many M 12s for sale by people that are not knowledgeable about the M 12 and are asking crazy high prices, and many with misleading descriptions...buyer beware. For me it is really interesting to watch the prices and the different gun for sael....JMHO...WC