Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
V2.2 Li-ion Digital NiCd NiMH Battery Charger (US Plug)
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. There is one great coupon!
Link: Banggood product page
1. ($33.99): FIN1172
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 88af83, SC1183, AC18, MOPUC, BGF1111, 2019FG, fInbG2020, BGff2020, BGSM30%, BGTBD, BG1128, BG10OFFAFF1
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Opus BT-C3100 V2.2 Battery Charger ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Opus BT-C3100 V2.2 Battery Charger US Plug.
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)).