Staples offers the Dust Destroyer Air-In-A-Can Duster 7-oz. 2-Pack
. Choose in-store pickup
via ship-to-store to dodge the $9.95 shipping charge. That's tied with last month's mention and the lowest price we've seen for these dusters. (It's about the same price we could find for a single similar duster in-store elsewhere.) Sales tax is added where applicable. It's designed for cleaning keyboards and other electronics.