Tronsmart via Amazon offers the Tronsmart 54-watt 5-Port USB Charger in Black for $19.99. Coupon code "5USBPORT" cuts the price to $12.99. Plus, Prime members receive free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $5.55.) That's the lowest total price we could find by $11. It includes a six-foot microUSB cable.