LumsingDirect via Amazon offers its Lumsing Series 21-watt 4-Port USB Wall Charger in Blue, model no. 206-1015-1003, or Orange, model no. 206-1015-1004 for $6.99. Coupon code "LUMS2017" cuts it to $3.49. With free shipping, that's $2 under our November mention and the lowest total price we've seen. (It's the best deal now by $9.) It automatically switches to the right charging mode for up to four digital devices for full-speed charging of up to 4.2 overall amps.