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Best Buy offers the Dust-Off Compressed Gas Duster 7-oz. 2-Pack, model no. DPSM2, for $4.99 with
free shipping. That's the lowest total price we could find for such this quantity of such an item by $6. Sales tax is added where applicable. It's purported to blast away dust and dirt from computers, printers, copiers, and more.
Update: It's no longer available for shipping.