I'd have to agree, the SKS is the ONLY one that will fall into the $250 or less range, and even that may be very hard to find. It's not uncommon here in Wyoming to see good clean SKSs sell for $400.
I'd love to find a Holland & Holland Royal in 375 Flanged, at under $3,000, but I am not holding my breath.
Or a Toyota Land Cruiser FJ 40 in perfect condition, for $1,500 or less.
You may beat me in your quest, before I find these things at these prices, but then again, you may not.