Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): K12315, AFfbG10, BGAFF10OFF, BGXK123, bGhOnEy10, BGMDB14, BGXK12, BGROK4, bgshOOp10, BGXK1230, BGheli10, BgoFErTaSchInA10, BgcLuBofErtA10, BGBF1134, BGCM1133, 7bcdf9, BGCuponation10, BGHONEY2110, BG9bb8f2, BGa2d361, BGMATT7, Drones6, BANGGOODSD, CouponsDE, 00c906, 2022ACTIESNL, BGRCDrones6, BGheli3
(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 XK K123 RC Helicopter RTF.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).