Aukey Direct via Amazon offers the Aukey 4-Port USB Car Charger in Black or White, model no. CC-01, for $14.99. Coupon code "CSNIU9GB" cuts it to $9.99. Plus, Prime members bag free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.01.) That's $2 under our February mention, $30 off list, and the lowest total price we've seen. It's compatible with most USB powered devices and can charge up to four tablets or phones simultaneously.