Inateck Online via Amazon offers the Inateck 4-Port 30-watt Compact USB Wall Charger, model no. UC4001, for $13.99. Coupon code "M7BM5EKO" cuts it to $9.99. Prime members qualify for free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.25.) That's the lowest total price we could find by $18, although it was $3 less in May. It features two 2.4-amp ports and two 1-amp ports.