Staples has Duster on sale for $3.30 a 2 pack. Pretty good deal IMO seeing how these are usually like 5-7 bucks a can...
http://www.staples.com/Dust-Destroyer-Duster-7oz-2-Pack/product_326196
Props to slick deals for the heads up..
http://www.staples.com/Dust-Destroyer-Duster-7oz-2-Pack/product_326196
Props to slick deals for the heads up..