For a limited time, on Amazon where you can now get this
Rubbermaid Reveal Cordless Battery Power Scrubber Set with 2 Heads for just $20.32 shipped!

Easily clean grout, tile, and more with this highly-rated Rubbermaid Power Scrubber! The oscillating head scrubs 60 times per second and it has two scrub settings. Plus this kit includes one regular head and one designed specifically for grout.