Some good sources for used pickup truck beds include Craigslist, eBay and PickupTruckSalvage.com. The Craigslist site for a major U.S. city can feature many ads for used pickup truck beds in that area.
A search for "truck bed" at Craiglist's Dallas site yields a number of new and used beds for pickups and other trucks, as of August 2015. Craigslist's main page features a list of sites for cities across the world from which a shopper can select the nearest city. Users can refine searches by the make and model, price, and other features.
A search for "used truck bed" at on eBay brings up more than 2,000 listings, many of them for used pickup truck beds. Shoppers can refine searches by completing search boxes on the left of the search results page with options such as the price and the location of the item.
Dundee Automotive in Dundee, Ohio, has a website dedicated to the sale of used truck parts at PickupTruckSalvage.com, and it includes a large number of used pickup truck beds. On the main page, the search feature provides a category for PickupBeds along with a drop-down box for the make and model of the truck. This search tool simplifies the task of finding a list of used beds for a given truck. Dundee Automotive can ship a product to a buyer, or the buyer can pick it up from the company's physical location.