Amazon offers Prime members the Black & Decker Power Scrubber, model no. PKS160, for $10 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $5.40.) That's the lowest total price we could find by $10. This fully-submersible power scrubber features a scraper edge, rubber grip handle, and two heavy-duty scrub pads. It includes four AA batteries.