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. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (381.79 USD): BGMatt2022
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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 coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (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).