Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Sorry, but there’s no price history in my database. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (25.41 USD): BGHealth06
(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): 13f142, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
There is only one database record (it was for 17 USD), so you can’t see price history chart.
You can set price alert (for Banggood).