I thought I'd share this with you. I picked up 4 Bridgestone RFTs with 80%+ tread left for $250 mounted and balanced. Absolutely INCREDIBLE!! I needed them in order to return my lease since the tires I purchased were bald/flat. A couple friends recommended this place to me. One of my friends goes there for Michelin PS2s for his E92 M3 and picks them up for 95 a piece! The place is called:
A & K Used Tires Inc
10850 Hanna St # G
Beltsville, MD 20705-2127
Ask for the owner, Omar.
Basically you call ahead and ask them if they have what you want. If they do, they will give you a price and hold them for you. All mounting and balancing is free. They can also handle plus size tires/wheels without a problem. If you pay cash you get the best deal