Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now. There is one great coupon!
Link: Banggood product page
Coupon (11.89 USD): BG2bb7a1
(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): BG4f067c, BGe5c0ef, BGa9f0c2, BG5c7749, BGAMSO, BG1c740a, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
There is only one database record (it was for 6.99 USD), so you can’t see price history chart.
You can set price alert (for Banggood).