Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. This is new product in my database, so I don’t know if this price is good.
Link: Banggood product page
Coupon (38.99 USD): BG6cc8b7
Coupon (40.03 USD): Cuponation9
Coupon (40.47 USD): BG8ReviTrage
(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): 9OFFSUMMER
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
It’s a new item in our database, so I can’t create price history chart. We have saved this price in database: 38.99 USD.
You can set price alert (for Banggood).