ATC LLC via Amazon offers Prime members the Lumsing 40-watt 5-Port Desktop USB Charger for $19.99. Coupon code "GNX84M4V" cuts it to $11.99. With free shipping, that's the lowest total price we could find for a similar item by $4. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.52.) It features fast smart charge technology, a built-in multi-protection system, and compatibility with most smartphones and tablets. Deal ends March 27.