Just grab something like this

http://m.ebay.com/itm/VINTAGE-APS-External-SCSI-Hard-Drive-APPLE-MACINTOSH-/151788396659?nav=SEARCH

Then you could use either a old 50 pin drive in it or a newer drive with proper adapters in it etc.

Or as another possibility you could just use external SCSI Zip drive if you don't need tons of storage space.