Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
ENCHEN MINT3 Water Flosser | 21.43 USD | – |
More on Aliexpress… Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (24.64 USD): BG75597c
Coupon (26.38 USD): Cuponation9
(CouponsFromChina.com tip: just apply this code 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): BGXPAP281, BGHB218, tRaDetRaCKeR, BGHECARE1, BG393ac6, BG4ee866, BGcd3eb1, BGHOM048, BG04c1d2, BGd55894, BG8992a6, BGHU2174, BG0cef99, BG9a5b34, BG2e2f19
(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 Enchen Mint 3 Oral Irrigator Water Flosser 140mL.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).