Aliexpress
Click here… to search for FullSpeed 4K TurboWhoop FSD428 F411 PNP Drone on 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 (179.99 USD): AFfbG10
Coupon (179.99 USD): BGBFCR25
Coupon (179.99 USD): BGCITYADS2019
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGRC4K, BGWK4K, BG4KPRO, BGF4K20
(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 FullSpeed 4K TurboWhoop FSD428 F411 PNP Drone is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).