Toyota Supra's still cost $20,000+ eventhough they are old and most of them are high milege. Very rare car.
Mitsubishi 3000GT's could be found around $6000-8000.
For the faster, 330HP twin turbo AWD V6 models known as the 3000GT VR4, it would cost you around $11,000.
Camaro's and Mustangs could be bought anywhere from $1000-10,000. Many used 1990's models are around $4000-5000.
www.cars.com
www.autobytel.com
yahoo autos
www.vehix.com
www.craigslist.com
msn autos
stradacars.com=They deliver worldwide and usually sell lots of Camaro's and Mustang's in good condition. I used to work there.