Adaptec SlimSCSI 1460 PCMCIA card.
http://www.adaptec.com/worldwide/pro...SI+for+Laptops $99 direct
New scanner, $40-80 at Staples or Office Depot.
Belkin once made a parallel-to-SCSI adapter that went for around $30. I had my hands on one once and was (surprisingly) quite pleased with it. IIRC, I only had a SCSI CD-ROM hooked up to it.
You can buy a new Canon USB scanner for $40-80 at Staples or Office Depot or wherever.