Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
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More on Aliexpress… Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (38.20 USD): BGAFF10OFF
Coupon (38.20 USD): BgcLuBofErtA10
Coupon (38.20 USD): BGCLUBOFERTA10
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): aff7off, e2bcea, FBCOUPON1, BGXMI15, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Mi Pro 10000mAh Type-C Power Bank.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).