Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (888.88 USD): BG5ae448
Coupon (1176.89 USD): Drones6
Coupon (1176.89 USD): CouponsDE
Coupon (1176.89 USD): 00c906
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGJPP35, BG6622bb, BGProtek888, BANGGOODSD
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for iFlight Protek35 HD 4S Drone with DJI Goggles V2.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).