Price history, coupons and price alert are available on this page. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
, Age Group: Adults, Brand Name: OCLEAN, Type: Acoustic Wave, Brand Name: OCLEAN, Item Type: Electric Toothbrush, Model Number: Oclean F1, Commodity Quality Certification: 3C, Quantity: 2, Material: Plastic, Size: 19.2*6.8*3.1, Bluetooth Connection: NO, , APP CONTROL: NOT SUPPORT, Commodity Quality Certification: CE
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($32.99): BGMAY079
2. ($44.99): BG10OFFAFF
3. ($44.99): BGwhielabel
this code has to be applied in your cart 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): BGBG2PCS2, BG2PCS2
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for 2 pcs. Oclean F1 Sonic Toothbrush? There we go.
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)).