Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (48.87 USD): 8wEbgaInS5
Coupon (48.87 USD): pROMo8cuPoN
Coupon (49.40 USD): 2203ActiesNL
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGSTHO15, BGHONEY2110, BGSHOM15, 13f142, BGSHE15, BGSmart6, 8BGwbg2204
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Uah Cat Litter Box Air Purifier.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).