Good luck getting any newish USB scanner working. Your best bet is very likely an older SCSI scanner. Software is a bit old too, but it's around.
You just missed two on ebay, that went pretty cheap IIRC.
shows here that there are some supported usb scanners (Epson/HP) through 3rd party packages. ScanQuix BetaScan fxScan.
http://www.platon42.de/poseidon.html
