Executive Standard GB 4706.1-2005 GB 4706 /58-2008, Charging time: about 4 hours Charging time: about 4 hours, Weight 400g, Waterproof rating: IPX8 Waterproof rating: IPX8, Brand XIAOMI, Rated input: 5V=1A Rated input: 5V=1A, Working power: 2W Working power: 2W, Size 61.3(Diameter)x289.2(Height)mm, Model MES605, Working voltage: 3.6V Working voltage: 3.6V.
Just check coupons out (with price alert and history). What is the best price?
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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($40.79): BGHECARE1
2. ($44.15): tRaDetRaCKeR
apply code in your basket (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): BGHB218, BGXPAP26
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for XIAOMI T301 MES605 Sonic Toothbrush? There we go. The lowest price was: $40.79.
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)).