GeekBuying via Amazon offers the Tronsmart Dual 2.4-amp USB Wall Charger with Quick Charge, model no. TS-WC2Q, for $14.99. Coupon code "DUALWALL" cuts it to $7.99. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's a light drop from our mention two weeks ago, $14 off list, and the lowest total price we've seen. It features Quick Charge 2.0, which purports to charge up to 75% faster than conventional technology, foldable plug, and over-current, over-heating, over-voltage, and short-circuit protection.