Aliexpress
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 (10.57 USD): BGMatt2022
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGToys1, BGRCT10, BGJUNEGSG9, BGRCParts8, Cuponation9, 9OFFSUMMER, BGToys8
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Happymodel Mobula7/Mobula7 HD/Mobula7 V2 75mm V3 RC Frame Kit.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).