From WABA:

Come buy, sell, or donate bicycles (or gear and clothing) at the WABA Bike and Gear Swap! Bike sales benefit the seller (90%) and WABA’s efforts (10%) on behalf of cycling in the Washington area; donations benefit the donor (a good feeling as well as a receipt good for tax purposes) and Bikes for the World provides jobs and access to school and health services here and overseas. In either case, your bike goes to good use. The Bike and Gear Swaps are hosted by The Bicycle Place (behind the shop) at 8313 Grubb Rd., Silver Spring, MD.