Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (280.27 USD): Cuponation9
Coupon (283.35 USD): BGJON8
Coupon (283.35 USD): hoNEYbGdeAlS
Coupon (283.35 USD): BG8ReviTrage
(CouponsFromChina.com tip: just apply this code 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): Drones6, BANGGOODSD, CouponsDE, 00c906, BGGAL8, BGAlerabat1, Tabby20, CouponsdeFPV, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG874251, BGJUNEGSG9
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for GEPRC SMART 35 Analog 4S Drone Caddx Ratel V2 is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).