Shark replacement vacuum filters are available from Shark, Amazon, Sears, and Bed Bath and Beyond. Shark offers a product finding interface that finds the correct filter based upon your selected model. The navigation includes pictures of each vacuum for easier selection.
Bed Bath and Beyond shows each item's availability in-store with an option to reserve it and pay in-store. As of 2015, Sears only has Shark filters available from third party sellers with no local availability. Amazon sells Shark filters directly and through third party sellers. Bed Bath and Beyond offers in-store returns regardless of whether or not the item is purchased online or in-store.