assuming no major problems, no serious rust, engine probs, etc, thats a really really good deal. welcome to the forums my friend.
for parts, check out
www.suprastore.com - Toyota Supra Pics, Toyota Supra Parts, Toyota Supra's For Sale, Toyota Supra Pictures, Used Toyota Supra, Supra MKIV Sale, Toyota Supra Twin Turbo although they have a big selection, they do not always have the best prices. try these sites as well, all have different advantages, so shop around.
Summit Racing - High Performance Car and Truck Parts | 800-230-3030
Performance Parts Online for Cars and Trucks - Performance Center