Brand SOOCAS, Executive Standard GB 4706.1-2005/GB 4706.59-2008, Modes Novice Mode/Gum Protaction Mode/Standard Mode/Burst Mode, Charging Time About 4 hours, Water Flow 1300 times/min, Water Tank Capacity 200ML, Product Model W3F, Waterproof Rating IPX7, Use Time About 90 days, Color Green/Pink.
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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.
Link: Banggood product page
1. ($55.79): BGHealth10D
2. ($58.27): BG00c906
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BANGGOODSD, BGOCXP261, BGHealth06, 00c906
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for SOOCAS W3F 200mL Oral Irrigator. The lowest price was: $46.99.
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)).