Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Sorry, but there’s no price history in my database.
Link: Banggood product page
Coupon (7.68 USD): BGf42493
Coupon (14.39 USD): BGVehicles10
(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): BGRCToy, BG96253b, BG085c2c
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
There is only one database record (it was for 7.68 USD), so you can’t see price history chart.
You can set price alert (for Banggood).