retail: $24
$12
Amazon with Aukey Direct has the AUKEY PB-N53-US 10000mAh Portable Charger with Dual Outputs for $24 - $12 off with coupon code 47OU8KKJ at checkout = $12 with free shipping.
AUKEY PB-T10 20000mAh Power Bank for $27 w/ code 7KMLY3V5
AUKEY PB-C7 12000mAh/400A Car Jump Starter for $28 w/ code F6WLREZN
On the Amazon listing page for the 10,000mah version, it currently has this listed under "Special Offers" instead:
"Save 50% each on AUKEY 10000mAh Portable Charger offered by AUKEY Direct when you purchase 1 or more. Enter code USIPNTS2 at checkout."
So it looks like the code just changed, but the offer is still good.