Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (94.49 USD): BG8075da
Coupon (122.84 USD): Cuponation9
Coupon (122.84 USD): BgGoodie9
(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): BG250862, BGJUNEGSG9, BG931faf
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for XK V912-A 2.4G 4CH RC Helicopter RTF with 3 Batteries.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).