$18.99 – Xiaomi Mijia T200/T200C Sonic Electric Toothbrush IPX7 Waterproof 31000 Vibrations per Minute with Dual Cleaning Modes Long Battery Life and Portable Features for Smart Oral Hygiene with Type-C Charging – Blue.
I have checked all old coupons and price is $18.99 for Xiaomi Mijia T200 T200C Sonic Toothbrush (in Banggood). Price history, coupons and price alert are available on this page. What is the best price?
Latest price update (UTC time):
Banggood ($18.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Well, is it a good price anyway? Looks like a good price to me (average is $19.74).
Link: Banggood product page
Price: $18.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG996217
(probably won’t work, but you can try them out)
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.
Price history and price alert
Price history (for all/most countries) for Xiaomi Mijia T200 T200C Sonic Toothbrush is here. The lowest price was: $15.99.
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)).