I noticed that my edge has been getting a little dull. So, I decided to purchase some slipstones from Woodcraft. I got a 4000 grit and 8000 grit slipstones for $33 plus shipping. I also got a 1000 grit for my pocket knives. I thought it was a good deal. They are having a clearance sale: Slipstones - Woodcraft.com They are also available in Canada from Lee Valley: Traditional Water Slip Stones - Lee Valley Tools Of course I waited till my order was shipped, before posting here.