Walmart offers the RCA Wall Plate with USB Ports in White, model no. WP2UWR, for $10.99. (Amazon has it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping fee. That's tied with last week's mention and the lowest price we could find by a buck. It converts any standard outlet into two USB charging outlets and one standard outlet.