Amazon.com and eBay have many used garden tillers available. Sometimes home improvement stores such as Sears, The Home Depot, Lowe's and Menard's have refurbished tillers for sale. Stores such as Sears Outlet may have discontinued, refurbished or floor models for sale, as well.
Online sites Amazon.com and eBay often have a wide variety to choose from. Refurbished tillers in the store are often customer returns that have been fixed and are new enough to be sold again. They are usually discounted due to having been repaired. Sometimes they still have a manufacturer's warranty. Outlet centers typically have floor models or discontinued equipment at reduced prices to make space for newer inventory in the stores.