Amazonhas theEleckey 2.1A Dual USB Car Chargerfor a low$7.99 with Coupon Code: "389PSAA2" (exp soon). Free Shipping on orders $35+ or with Prime. Tax in many states. This is currently on sale for $10.99 ($15.99 list), so you are saving an extra 27% with coupon. Amazon user rated 4.4/5 with over 500 reviews 2.1A MAX dual USB ports Brushed aluminum finish with circular blue LED light Certified by RoHS, CE, and FCC; made from fire proof materials Charging stops when battery is full Protection fromshort circuiting, over-heating, over-current, and over-charging Input: DC 12-24V, Output: DC 5V/2.1A; Dimensions: 2.7 x 1 x 1" 1 year warranty + 24/7 tech support