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 (20.79 USD): BG8ff0ca
Coupon (21.99 USD): BGbbcef6
(CouponsFromChina.com tip: apply code in your basket (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): BG0a1fff, BG62b144, BG8OFFCOUPON, TTBLACK5, BGe181bd, BG960070, BG6bb926
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 16.8 USD.
You can set price alert (for Banggood).