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 (219.64 USD): BGAFF10OFF
Coupon (219.64 USD): bGhOnEy10
Coupon (219.64 USD): BGdragonBoat
Coupon (235.04 USD): 7bcdf9
(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): AFfbG10, BGTMC, Wholesale20, BGVDay10%off, BGTMC12, BGSS10%SW
(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 Diatone TMC AirBlade 150mm F4 3-4S Drone is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).