Charging Time 1 Hour, Net Weight 164g, Size 52x145mm, Brand SEP, Rated Power 5W, Endurance 1.5 Hour, Color Black, Rated Voltage 3.7V, Model Number S1.
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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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($16.14): BGHB218
2. ($17.85): BG00c906
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGXPDE0141, 00c906, BGXPJA202, BGHealth10D, 2022ACTIESNL
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for SEP S1 Electric Shaver is here. The lowest price was: $15.99.
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)).