Go down and check coupons out. Remember to check price history if it is available. What is the best price?
Full Battery Can be Used for 100 days(1 time each day /1 min each time), Cleaning Mode 3-mode (gentle/standard/pulse massage), Water Tank Capacity 170ml, Material FDA Certificated ABS Nozzle + food-grade PC Body, Dimension 70x 44x 146mm (no with nozzle), Suitable User above 13 years old, Waterproof Grade IPX7, Charging Voltage DC5V.1, Color Blue/White, Charging Method Magnetic Charging, Charging Tme 4-6 H, Noise Value ≤75dB, Model LK-WF1, Net Weight 235g (with nozzle), Brand LOSKII
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($12.99): BGNOXP37
2. ($13.99): BGOCXP271
3. ($23.16): BGHealth06
you should apply the coupon in your 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): BGHONEY2110, BGAPLOSIS, BG10OFFAFF, BGwhielabel, BGJUY09, 13f142, BGAU3104, BG10OFFAFF1, BANGGOODSD, BGDU1135
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for LOSKII LK-WF1 Oral Irrigator.
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)).