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. One coupon is available. Cool!
Link: Banggood product page
Coupon (38.99 USD): 13f142
(CouponsFromChina.com tip: you should apply the coupon 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): BG20QCY, TTxBG10, aff7off, BGkonimbesinT3, BGT3, BG3CSUM, bgssaff9, AFfbG10, 502C6B, BGCITYADS2019, BGQCYT3CF, BGT3377, BGQCYT3, BGVDay10%off, EARSP11, BGTT10, bGhOnEy10, bgshOOp10, BG11SHOP, BGSK801, BG4BW25, BGLOAC1
(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: 29.99 USD.
You can set price alert (for Banggood).