As one of its daily deals, Amazon offers Prime members the Belkin SurgePlus 6-Outlet Wall Mount Surge Protector, model no. BSV602tt, for $13.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.56.) Outside of the mention below, that's the lowest total price we could find by $3. It features a 900-joule energy rating and two powered USB ports. Deal ends today.
A close price: Webs Best Deals via eBay charges $14.99 with free shipping.