A Home Depot catalog is available on HomeDepot.com as well as through electronic catalog providers such as Flipseek.com. Each Home Depot location has the right to make its own local catalog, so be sure to look at the correct location.
HomeDepot.com also offers the option to request a hard copy catalog, though as of July 2015 the link does not work. Owners of the hard copy version have a special section of the website where they can purchase items based on the catalog number. HomeDecorators.com, another site affiliated with The Home Depot, offers a request form for a hard copy catalog.