Another vote for pawn shops. I've bought a few over the years from places like that and usually they need a serious cleaning but you can find a pretty good gun for a small price tag.
Some years ago I found an AMT Lightning 25/22 in a pawn shop for under 100 bucks. They are a copy of the Ruger 10/22 and where forced to stop making them after Ruger spanked them. This rifle has a stainless steel receiver that's dovetailed for mounting glass and a 24" bbl. It's go tras but ugly poly/plastic stock but the thing shoots better than some other 10/22's I have here with much more money in them. Probably one of the best buys I ever made.
..HEH..Even come with two (ruger) mags. I've come to love pawn shop guns since then. Same place I got a stainless loaded Springfield 9mm 1911 that had a killer trigger job done to it, flared mag well and 4 mags. All of 500 bucks!
It's worth trolling the pawn shops now and then