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 (165.38 USD): Drones6
Coupon (165.38 USD): CouponsDE
Coupon (165.38 USD): 00c906
(CouponsFromChina.com tip: apply code in your basket (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): TTxBG10, aff7off, bgssaff9, AFfbG10, 502C6B, BGBFCR25, BGCITYADS2019, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BG10RACING, BGCuponation10, 7bcdf9, BGMATT7, BGDAVIS, BANGGOODSD
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for T-MOTOR FALCON15 Drone PNP.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).