13Deals offers the Xtreme Cables 3-Outlet Wall Tap with 2 USB Ports in White, model no. 28311, for $9.99. Better yet, add two to your cart for $14.98. With free shipping, that's $7.49 each, the lowest total price we could find for this quantity by $5, and the best per-unit price we've seen. (For further comparison, we saw a single unit for $12 in September.) It features sliding safety covers to protect children.