PricePlunge offers the Powerocks Magicstick 2,800mAh Universal Extended Battery in Orange, model no. 370854, for $3.99. Coupon code "coldplunge5" cuts it to $3.79. With $1.99 for shipping, that's tied with our expired mention from three days ago and the lowest total price we could find by $3. It features an LED charge indicator and microUSB charging cable. Deal ends March 31.