Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
5 Brush Modes Essence Sonic, 5 Brush Mode (Clean, Sensitive Care, Soft Massage, White, Polish), Vibration Frequency 31000+ Per Minute, IPX7
Aliexpress
There’re some similar (or not) items 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. ($27.53): BGAFF10OFF
2. ($27.53): bGhOnEy10
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): DGYS1129, CP1205, 99ce41, code1573, CODE1573, 502C6B, vipupgrade8, ce2ca1, TTxBG10, BGYS21, BGDigoo15%, BGPYS1155, AFfbG10, BGDG1119, BGDGR189, BGBGHFRI15, BGIHNQ, BG030301cyy, BG22iMars, BGDG15, BGIYS11, 20%DG422, BGdragonBoat, BGSS10%SW, BGDGASG, BGHome15%, BGCuponation10, 13f142, BGHONEY2110
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Europe – Digoo DG-YS11 Sonic Toothbrush White [EU] ($-3)
2. China – Digoo DG-YS11 Sonic Toothbrush Black ($-3)
Price history and price alert
Here is price history (for all/most countries) for Digoo DG-YS11 Sonic Toothbrush White.
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)).