Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Color White, Weight 1000g, Capacity 2L, Material ABS, Size 157x 216mm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($49.91): 13f142
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGPTWFJP, SKUE16923, AFfbG10, BGHU531, BGBAPOHG, BGPJPP, BGHHMJP, BGHOMEG12, BGJKLJP, bGhOnEy10, BGJJCWJP, bgshOOp10, BGHome15%, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for HomeRun 2L Pet Smart Pet Water Dispenser is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).