$14.94 – Feature Eco-friendly, Brand name ADAEE, Weight 7.06 oz (200 g), Type Sharperner, Quantity 6 Pcs (180# 400# 800# 1500# 2000# 3000#), Color Brick Red + White, Material Oilstone.
I have just checked coupons. The lowest price I could get is $14.94 for 6Pcs 180/400/800/1500/2000/3000 Sharpener Stones (in Banggood). Just check coupons out (with price alert and history). Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood ($14.94)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Good or bad price? This price is higher than average price ($14.55) for this item.
Link: Banggood product page
Price: $14.94
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGGines, BGPTL088, BGHT15, BGPHOOL8, BGHPT15, BG589b2e, BGHTT15, BG20236Tool
(these codes were not working in latest coupon update, but you can check them out anyway)
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.
Price history and price alert
Do you need price history chart (for all/most countries) for 6Pcs 180/400/800/1500/2000/3000 Sharpener Stones? There we go. The lowest price was: $9.99.
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)).