Bestek via Amazon offers the Bestek Window Cleaning Tool Kit for $47.97. Coupon code "BI6LPJUS" cuts the price to $33.58. With free shipping, that's $14 off list and is the lowest price we could find. It features 3.7-volt 12-watt dust filter, squeegee, spray bottle, and the extension set can adapt from 10" to 40". Deal ends December 30.