Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-R02 Rotary Toothbrush (26.99 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Sorry, but there’s no price history in my database.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGDigoo15%, 20%DG422, BGTMCB7, BGDGASG, BGDGO255, BGE1943, bGhOnEy10, BGSD58965, BgcLuBofErtA10, BGD1799, 13f142, BGAFF10OFF, BGHBHJ105, BG21943, BG19561, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGjune47, BG10OFFAFF1, BGHealth06, BGHealth10D, 2022ACTIESNL, BG4ee866, BGd68176, Cuponation9, 9OFFSUMMER, BG75597c
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-R02 Rotary Toothbrush (26.99 USD)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 17.99 USD.
You can set price alert (for Banggood).