Thumb Score: +31

Woot! [woot.com] has 20000mAh Anker PowerCore 20K 2-Port 15W Power Bank for $26.99 – extra 20% off (in the Woot app!) = $21.59.
Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.

Discount shows on the page with the “PLACE ORDER” button only.