Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (41.02 USD): BGAHPU13
Coupon (42.91 USD): Cuponation9
Coupon (44.32 USD): BG00c906
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG7b75b2, BG817990, BGHW116, BGHUA02, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, DealBGimpact, 9OFFSUMMER
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Christmas Snowman Mini 2 in 1 Hand Warmer Power Bank 6000mAh.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).