Just check coupons out (with price alert and history). You probably want to know what is the best price?
Product name: Crux35 HDZERO, Weight: Crux35 87gram, Brand: Happymodel, Crux35 HD 108gram, Wheelbase: 150mm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($246.96): BGGutscheine
2. ($249.68): BGMatt2022
3. ($249.68): BGToys8
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): Cuponation9, 9OFFSUMMER, COUPONSDE1wk, BgGoodie9
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Happymodel Crux35 HDZERO 150mm 3.5 Inch 4S Drone BNF is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).