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 (36.89 USD): BGeaf456
Coupon (37.71 USD): BG8ReviTrage
Coupon (38.53 USD): BG00c906
(CouponsFromChina.com tip: this code has to be applied in your cart 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): BG4fae16, 6GSGIT, BG003ad6, BGa850b4, 00c906, BG8a1b42, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, DealBGimpact, Cuponation9, 9OFFSUMMER, BGAHPU13
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for YouPin XinKe Heating Mouse Pad? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).