Hi Sigurd! Welcome to A!org.
Amikit sells Cocolino which allows you to use PC mice. Or, there are ebay sales for used mice, and sites like oldsoftware, which have supplies of older mice left over. Just look at the bottom of the A.org screen and there are plenty of links to suppliers.
I haven't done any transfering except by putting files on a 770k floppy, so I can't recomend the other stuff. :-)
