Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now.
Link: Banggood product page
Coupon (33.11 USD): BG8ReviTrage
Coupon (33.11 USD): BGcoupon8off
(CouponsFromChina.com tip: this code has to be applied 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): BG4daa44, tRaDetRaCKeR, 8wEbgaInS5, hoNEYbGdeAlS, BGJUNEGSG9, DealBGimpact, Cuponation9, 9OFFSUMMER
(there’s a little possibility that old coupon will work)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 18.99 USD.
You can set price alert (for Banggood).