benjgvps, here's two reasonably priced on eBay right now and they turn up all the time. If you wanted easy, vintage Mac-ing was definitely the wrong hobby ...

http://cgi.ebay.com/Vintage-ASANTE-Micro-EN-SC-SCSI-Ethernet-Adapter-IN-BOX_W0QQitemZ110229308079QQihZ001QQcategoryZ51046QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/Asante-EN-SC-10T-SCSI-Ethernet-RJ45-Interface_W0QQitemZ230223503170QQihZ013QQcategoryZ80061QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem