Aliexpress
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Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (12.19 USD): BGTorch4
(CouponsFromChina.com tip: put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGTORCH, BGAFF10OFF, BgoFErTaSchInA10, 4BLF, BgcLuBofErtA10, BGFLS15, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for BASEN BC-2 Battery Charger.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).