You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Capacity (mAh): 20000mAh, Output: 5.1V 3.6A / 9V 2A / 12V 1.5A, Bi-directional QC 3.0
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($40.49): BGAFF10OFF
2. ($40.49): BgcLuBofErtA10
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG2c182w, 2cpower, 2cxiaomii, 2cxbank, 2cxiao2c, 2cpbank, 2cxmbk, 2c2mi2, 2cmikn, 2cnnbak, 2cnjdh, 2cbfmi, 1wmixk, Alibuy2c1, dlzxm2c, 2cbnbmc, Alibuy2c2, xmbbfk, 2cminkg, konimbesin20, 2c2cimi, konsimbank, mi2ckbn, 2cmi2c1, 2wcbnd, easybuy2c, 2cbmibn, bg2cxm, BG2c2mi, BG2Cmi2, BG2cpb2, BGmi2cb, BGPB2C, BG2cbwpb, Bg2c96p, BG2CPB, BG2cmibp, BG2cds94, BG2c912, BG2c23bp, BGmi2c10, BGmi2cmi2, BG2c111w, BGBF15, BGmi2c26, BGBINKUPON08, BG252cmi, BGXMC21, BGALIBUYX2C, BGVDay10%off, BG20KRA, BGXM2C19, FBCOUPON1, BGXM2Ca, BGXM2Cem, bGhOnEy10, BGXMI15, BGxiaomi235C, BGdragonBoat, BGXiaomiBank200, BGSS10%SW, BG9Xiaomi2C, BGXiaomi2CES, BgoFErTaSchInA10, BGOTCXiaomi2C, BGXiaomi20000AU, BGXiaomi20000Bank, BGXMPB2CG, BGXiaomi20000GC, BG2Xiaomi2CRU, BGHONEY2110, 13f142
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Power Bank 2C 20000 mAh [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Power Bank 2C 20000 mAh.
Price records source(s): Gearbest, 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)).
Hi,
The coupon code BGXM2Cem that lowers is to 19.99$ is not valid anymore. Is there any other coupon that lowers it to 19.99$ that I can use to order it?
Sorry, but there is no such coupon
The stock in Gearbest is in their “hk-4” warehouse. This warehouse can not ship to any country in the world. looks like it’s a virtual warehouse.
I will change product link.
There is shipping option for other items from this warehouse. Example: https://www.gearbest.com/rc-quadcopters/pp_328232.html?wid=1527929