Lowe's Home Improvement Stores offer flashings, roll roofing, roof coatings, roof panels and accessories, roof seam sealers, roof shingles, roofing tools and roof underlayments. Screws, vents, nailers, and backer boards are also available. Supplies are purchased both online at the Lowe's website or at one of their many stores.
The Lowe's website allows you to search for items according to the inventory that is currently available at your closest store. Alternatively, selecting 'all products' lets you see the complete inventory list.
The website also offers useful "how-to" articles on the subject of roofing, from buying the right particle board to installing shingles and gutter screens.