Xiaomi Oral Cleaning Kit T500 Toothbrush Irrigator (Banggood, Aliexpress: 1x XIAOMI Sonic Electric Toothbrush T500 Handle, 3x Brush Head Protection Cover, 1x Charging Base / Charging Base Bracket, 1x Standard Nozzle, 1x Periodontal Pocket Nozzle, 2x Universal Brush Head, 1x Power Shaft Protection Cover, 1x Sensitive Brush Head, 3x Color Ring (1 Installed / 2 Replacements) (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($101.99): BG75597c
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): Cuponation9
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Oral Cleaning Kit T500 Toothbrush Irrigator is here. The lowest price was: $97.99.
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)).