Monoprice via Rakuten offers the Monoprice 12 Outlet Power Surge Protector with 2 USB Ports for $31.99. Check out with V.Me by Visa to cut the price to $21.99. (If it doesn't show this price, you may need to apply coupon code "VMEDEALS".) With free shipping, that's the lowest total price we could find by $16. It features 4,230 joules of protection.