Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (633.43 USD): Drones6
Coupon (633.43 USD): CouponsDE
(CouponsFromChina.com tip: apply it in your 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): BG470LM15, AFfbG10, 502C6B, BGBFAFF2019, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGheli10, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7, BANGGOODSD
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Align T-REX 470LM 470L Dominator RC Helicopter RH47E01XT Super Combo.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).