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): bGhOnEy10
Coupon (179.99 USD): BGdragonBoat
Coupon (179.99 USD): BGAFF10OFF
Coupon (179.99 USD): BgcLuBofErtA10
(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): TyrantS, d8f2bb, TTxBG10, 10drones, 2019SPEDM, Wholesale20, AFfbG10, BGDTS215, 502C6B, BGBFCR25, BGCITYADS2019, BGVDay10%off, BGMPB2020, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Diatone Tyrant S 215 F3 FPV Racer PNF.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).