Thumb Score: +28

Amazon [amazon.com] has Baseus 20,000mAh 45W PD Power Bank w/ USB-C Cable for $39.99 – $8.99 when you apply promo code L3PTWW4V on the checkout page = $20.99.
Shipping is free.

Price
$19 lower (48% savings) than the list price of $39.99
$8.99 lower (30% savings) than the previous price of $29.98