As one of its daily deals, Best Buy via eBay offers the Legrand/Pass & Seymour USB Combo Wall Outlet, model no. TM826USBWCCV6, for $19.99 with free shipping. That's $8 off list and the lowest total price we could find. It features two standard outlets and two USB ports. Deal ends today.

Update: Amazon offers the Topgreener USB Combo Wall Outlet, model no. TU2154A, for $15.99 with free shipping for Prime members.