Aliexpress
Click here… to search for GEPRC SMART 35 HD 3.5 Inch 4S Drone on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (381.79 USD): BGMatt2022
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BG16c044, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGRCT10, BG874251, BGJUNEGSG9, BG8ReviTrage, Cuponation9, 9OFFSUMMER, BGToys8
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for GEPRC SMART 35 HD 3.5 Inch 4S Drone.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).