Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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):
IPX7 waterproof, Double-ring blade, Stainless steel cutting head, 360-degree cutting movement, Charge for 8 hours and run for 45 minutes, Built-in 2x 450mAh lithium battery
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($20.46): vipupgrade8
you should apply the coupon in your 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): EnlightyOurlife, HHHHHOT, healthylifestyle, 8046b1, 04bd3b, MISHAVE, MS567, 20%OFFSUMMER, BGMISHAVE, ML15%Pro, BGS1669, BGZBMS0, BGHC715
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Mi Home Men Electric Razor is here.
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)).