BC Master via Amazon offers the BC Master USB Car Charger for $7.99. Coupon code "A9GWN3FA" drops it to $5.03. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.01.) That's $3 off list and the lowest total price we could find. It includes a 3.3-foot micro USB cable.