Quad City Coin brings the experience of over 80 years buying coins & over 33 years buying antiques to your front room. Quad City Coin & Antique buys estates (in-whole or in-part) and accumulations in a 7 state area. How do we do buy so much? We work close, and we pay a little more for nice items. How do we sell so much? We only mark up items a small amount over cost to keep inventory moving and fresh.