Where can I find a 4000,5000,6000, or 8000 grit for cheap. I have a smiths tri-stone so I have 220,600, and 1000 grit, I move up to my 10000 grit I found for cheap on ebay, however I have been told that I need to move up gradually and was wondering where to find cheap stone, I was also told all I need is a 5000 grit stone than I can move onto my 10000 grit and than my dual sided strop with gray and green compound.