Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
XTAR Power Bank 18650 Battery Charger PB2S | 26.97 USD | Paste $2/2,01 coupon “IC2O2GWKEIFC” in the cart |
 |
Nitecore LR60 18650/21700 Camping Flashlight Power Bank Charger | 115.48 USD | Paste $5/35 coupon “8888NITECORE” in the cart |
More on Aliexpress… Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): e2bcea, aff7off, BG3CSUM, BGaDmITAd, bgchinafest, BGBFAFF2019, BGCITYADS2019, 2020CNY, BGVDay10%off, BGAFF7OFF, bGhOnEy10, BGXMI15, BGdragonBoat, BGSS10%SW, BGAFF10OFF, BgoFErTaSchInA10, BgcLuBofErtA10, BGHONEY2110, BANGGOODSD
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for 18650 Power Bank DIY Case.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).
The coupon is only available for new users.