As one of its daily deals, 13 Deals offers the Global Electric Portable 3-Outlet Power Strip with USB Port for $4.99. Better yet, add two to your cart to drop the price to $7.98 ($3.99 each). With free shipping, that's the lowest total per item price we could find by $4. It features three AC outlets, a USB port, 12" cord, and right-angle plug.
Of note, when you purchase 10 or more, the price drops further to $29.90 ($2.99/item).