Xiaomi Oclean F1 Sonic Toothbrush (Banggood, Aliexpress: Charging Time: 2H, RPM: up to 36000, Input Voltage (V): 5V, Working Current: Standard file 400 ± 10mA; strong file 500 ± 10mA, Battery Information: 800mAh, Input Current: 1A, Materials: ABS, IP rating: IPX7 (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
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 Hong Kong.
Link: Banggood product page
1. ($29.99): BG2f1afa
2. ($30.59): BG4ee866
3. ($30.99): BGc97422
4. ($33.83): BG00c906
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/feV
Old coupons (from the oldest to the newest): BG4937, BGHU980, BGF1937, BGF1493, BGAFF10OFF, BGF2299, BgcLuBofErtA10, BGCF1499, BGOCLEAN2, BGOCF1, BGF14937, BG19561, BG22371, BGWT1499, BG10OFFAFF, BGMAY048, BGwhielabel, BGjune10, BGjune21, BGjune28, BGjune50, BGjuly63, 13f142, BGjuly0770, BG10OFFAFF1, BG73202c, BGa20c4f, BGcd5bb8, BG8b78ee, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGHB218, BGXPAP263, tRaDetRaCKeR, BGHECARE1, BG39a0fe, BGab19c1
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Oclean F1 Sonic Toothbrush. The lowest price was: $9.99.
Price records source(s): Gearbest, 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)).