Aliexpress
Click here… to search for Elspet 4L Cat Toilet Self Cleaning on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (460.59 USD): BG589b2e
(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): BGJUNEGSG9, BG8ReviTrage, Cuponation9, BgGoodie9, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, BGbd1aa8, TTBLACK5, JanBGCoupon8, BGSaleFeb8
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Elspet 4L Cat Toilet Self Cleaning.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).