Coupon brings it down to $9.99 (available from Banggood). 30cm/12″ Diamond Knife Sharpener Sharpening Steel 600 Grit Oval Design Efficient and Safe Tool Sharpening.
Updated: 26-07-2025
Banggood
Warehouse in China.
Link: 30cm Diamond Knife Sharpener 600 Grit
Price: $9.99
Additional Banggood coupons:
1. First page
2. Second page
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 30cm Diamond Knife Sharpener 600 Grit. The lowest price was: $5.99.
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)).