Basically copy coupon, view price history or create e-mail price alert. Best price?
Power 5 W, Charging Time 5-8 Hours, Interface USB Interface, Color Black/Gold, Material ABS, Battery Built-in Rechargeable Lithium Battery, Use Time 40~50 Minutes
Aliexpress
There’re some similar (or not) items on Aliexpress
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. As you can see I didn’t find any active coupon for this product right now…
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG1434d1, BG75597c, BG879468, BG474161, BG4b90eb, BGff3c26
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Electric Shaver Kit [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for Electric Shaver Kit Golden is here.
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)).