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 (165.59 USD): BG8OFFCOUPON
Coupon (169.19 USD): BG00c906
(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): BGpet001b, BGpet1206cc, 00c906, BGpetXY11, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, 8Couponsde, MVC8SPRING, 8BGwbg2204, BGPET412015, pROMo8cuPoN, BG58e9cf, hoNEYbGdeAlS, BGJUNEGSG9, BG8ReviTrage, Cuponation9, COUPONSDE1wk, BgGoodie9, BGcoupon8off, BGGutscheine
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Dogness Intelligent Pet Feeder 6L.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).