Aliexpress
Click here… to search for ALIGN T-REX 500X RC Helicopter Dominator Super Combo on 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 (843.19 USD): BANGGOODSD
Coupon (852.26 USD): Drones6
(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): BG500X12, TTxBG10, bgssaff9, BG500X15, BGCITYADS2019, Wholesale20, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGheli10, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for ALIGN T-REX 500X RC Helicopter Dominator Super Combo is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).