I paid $900 for my unmolested, rust-free, S13 and $500 for a rust free kouki S14.
If you're not looking to pay the drift tax, don't look in places where it will be at it's highest (aka here). Check newspapers, autotrader (if it's even in print still, haven't looked in the past year), and craigslist. Networking with people in the car scene always lands good deals too. Auctions are amazing too.
http://www.copart.com/c2/homeSearch....SEARCH_RESULTS