Do you have separate tables for each machine? If that is the case I would probably make the investment in duplicates (triplicates) of staples (cutting tools; bobbins; seam ripper, etc) for each table so you are not running hither and yon each time you need to do a particular task. Take a look at the various little storage boxes at JoAnns to see what fits in the various drawers. If you don't have machine-specific tables, then the rolling storage cart would probably be the hot tip.