Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (28.19 USD): BG00c906
(CouponsFromChina.com tip: apply it 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): BGGRSL9111, BGTY9111, BGHONEY2110, BG77SL91, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for EasySMX SL-9111 Wired Joystick Controller Gamepad.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).