Update: this deal still works but it may take a couple tries to successfully add it to your cart. Today only, this Powermat Phone Charging Mat is $9.99 plus $5 for shipping at CowBoom.com. The next-best price we could find was $38 at Amazon! This mat charges batteries for up to 3 phones at once by resting them on its surface. It works for Blackberries, iPhones, and other phones as well as gaming systems like the Nintendo DSi or Sony PSP. Sales tax is charged in most states.