Pisen via Amazon offers the Pisen 4-Port Portable USB Wall Charger in Black for $7.49. Coupon code "GHDG2J5K" cuts the price to $6.99. With free shipping for Prime members, that's tied with last week's mention, $16 off list, and the lowest price we could find. It features a 100- to 240-volt input. Deal ends February 20.