Kensington mice and trackballs are available at the major computer supply stores at substantially lower cost than shown at their Web site. Lefties Internet store. Large selection, including computer equipment. According to their site, this Houston, Texas store carries the complete line of lefty Martin guitars in addition to lefty guitars by other major manufacturers. Another online lefty guitar store.
Prices go up and down from there.
This could be the solution lefty pickers have been looking for. I think this shop is in England. If anybody knows for sure, please let me know.