Walmart offers the Gardus LintEater 10-Piece Rotary Dryer Vent Cleaning System, model no. RLE202, for $22.88. (Amazon and Sears have it for the same price.) Opt for in-store pickup to dodge the $4.97 shipping charge. That's tied with our February mention and the lowest price we could find by $8. It's designed for use with a cordless drill and includes cartridge respirator parts, a long extension that can extend into ducts, and a vacuum adapter.