Anker PowerCore II 20000, High Capacity Portable Charger with Dual USB Ports $37.88

Normally $49.99
On the item page, 2 promotions are available. Select "Redeem now" on the promotion labeled "Get 1 of Qualifying items for $34.99 offered by AnkerDirect". After that, discount is applied during checkout.
https://www.amazon.com/Anker-Powe…B01LQ81QR0