LiitoKala Lii-MP2 21700/18650 Battery QC3.0 Type-C Power Bank (Banggood, Aliexpress: Constant charging current(auto-selcletive） 2Ax2 / 2Ax1 / 1Ax2, Model Lii-MP2, Charge cut off voltage 4.20±0.05v, USB Power bank output QC3.0&PD3.0（DC: 9V2A/12V1.5A)DC: 5V2A, Operation temp.range 0-40℃, input QC3.0&PD3.0（DC: 9V2A/12V1.5A)DC: 5V2A, Charge cutoff current ≤120mA (the best price with coupon)).
Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch3
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for LiitoKala Lii-MP2 21700/18650 Battery QC3.0 Type-C Power Bank? There we go. The lowest price was: $18.69.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).