LumsingDirect via Amazon offers the Lumsing 10,000mAh 3-Port USB Portable Battery Pack in Black, model no. 206-1008-1066, or White, model no. 206-1008-1067, for $14.99. Coupon code "5CQQPI36" cuts it to $8.99. With free shipping, that's a buck below our January mention and the lowest total price we've seen. (It's the best deal now by $2.) It's compatible with iOS or Android devices, features three USB ports, and comes with a USB cable.
Note: For white, select "new from" and select the option that is not fulfilled by Amazon to get free shipping without requiring a Prime membership.