Wybrance via Amazon offers Prime members the Wybrance Dual USB Car Charger for $14.95. Coupon code "DVPPPBOL" cuts it to $7.47. With free shipping, that's $22 off list and the lowest total price we could find. (Non-members can spend $35 or more for free shipping; otherwise, it adds $5.07.) It features a blue LED power indicator and 2.1-amp output.