Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (44.09 USD): AFfbG10
(CouponsFromChina.com tip: just apply this code 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): TTxBG10, BGss9%rc, bgssaff9
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for AE86 FD3S RC Car From Xiaomi Youpin.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).