Here is a way to get some small carbide grinding wheels free. Ask people to give you their empty disposable lighters. Remove the flint wheel by prying off the metal front and then just pull it out. Knock out the shaft and put it on a dremel tool. These things really cut. Good for wood carving, background removal, and I am sure jewelers could find a lot of use for them. Of course you always want to wear safety glasses when grinding.