ATC LLC via Amazon offers the Lumsing Cube Series 21-watt 4-Port Intelligent USB Wall Charger in Orange, Gray, or Blue, model no. 206-1015-1004, for $12.99. Coupon code "HCUSMKN4" drops it to $8.99. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.22.) That's the lowest total price we could find by $4. It features intelligent quick-charge technology, which automatically detects the optimal charging charging rate. Deal ends December 31.