I never really looked at them closely, since I never needed one. next time I go I'll look around. no websights since it's mostly from private sellers. there isn't much mark up on them since most who have them don't really care if the sell it or keep it forever, and enough of an interest that they don't often go very cheap. so dealers are mostly uninterested. unless they are collectors, but collectors love all of their stuff so much that they never give a good price, so you only go to the collectors if they have something you just can't live with-out.
the only hard part might be finding one un-altered. I wouldn't imagine paying more than $175-200 if you found one un-altered and in great condition. maybe $125 for one thats had a rough life but is good mechanical condition. just guesstimates though since I never really gave them much serious thought.
something like that would have to be a steal(under $60) to catch my eye if I wasn't specifically looking for one.
thats how I buy most of my guns anyway. 1 or 2 that I set out to buy, but the rest were just so good of a price that I couldn't pass it up.