Just check coupons out (with price alert and history). Best price?
Color White/Black, Battery Life 28 Days, LCD Screen Display 0.96” TFT-LCD, Maximum Torque 408 gf.cm, Battery Life 28 Days, Brush Head Identification NFC Tag (NTAG213) Chip, Smart Power on Movement Detection, Clean Frequency 42000 times/min, Charge Capability 100% charge in 3.5 Hours with Default Charger, Charging Mode Wireless Charging / Compatible with Qi Chargers, Vibration Mechanism Sonic Oscillation, Brand Evowera, Sensitive Oral Area Define Support, Motor Servo Motor, Stress Intensity Level Continuous Variable Force Adjustment, Clean Mode Adaptive Mode + Five Basic Cleaning Modes
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Suitable for Evowera Electric Toothbrush Planck O2 Replacement Heads Medium Hardness DuPont Vacuum Nozzles Evowera Brush Heads | $12.28 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($178.59): BG589b2e
coupon code has to be applied in shop’s 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): BGd1b10e, BG4ee866, BGEVO026, BG8ReviTrage, BGa49475, Cuponation9, 9OFFSUMMER, BGd0af99, BG75597c, BG42d474, BGc1cd3c, BGc37323, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BG0328d, BGgh0418h, BGMARCHSALE
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Evowera Planck O1 Electric Sonic Toothbrush.
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)).