SCSI or ATAPI zipdrive in both ends.
100MB (or even 250MB) at your disposal. and it is a fairly cheap option. (though, SCSI drives tend to be costly...)
If you go ATAPI route, a 750MB drive should work, but i dont know of anyone that has tried....
Of course there is
THIS option. have no idea where to get one. If you do, let me know...