Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGRCParts8, Tabby20, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGJUNEGSG9, BGRADIORU, BGToys8, BGSaleFeb8, BGMatt2022, BG589b2e, BG8FORMULAMX
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for HappyModel ES24TX Pro 2.4GHz 1000mW ExpressLRS ELRS RC Micro TX Module? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).