The bits and accessories sold by Dremel are a total rip-off! The identical items can be found at a fraction of the price that Dremel charges at any wholesale jewelry making supplier. Not only will you save lots, but you will find a much greater selection at these places.
Typical are things like minature buffing wheels: $2.99 for a pack of 3 from Dremel, .40 each out of a bin at a shop here. Mini grinding wheels from .50 each, sets of micro drills form a couple of buck and so on.
If there isan't a supplier near you, check the web: many deal mailorder - savings on a small order should more than cover shipping..