The Stockpile is an in-game and digital storefront. The store allows players to purchase in-game items such as cosmetics, skins, and tools using money stored in their Steam Wallet. Many of the items are community-contributed, and the creators of those community-contributed items receive a percentage of the sales. Aside from the main in-game interface, purchases can be made through the Steam Item Store.
Most items bought from the Stockpile are not marketable, with the primary exception being the contents from mystery boxes. For items only available for a limited amount of time, they become marketable after they are no longer purchasable from the Stockpile. New items are periodically added to the store.