RLECS FireWire IEEE 1394 Type A 400 6 Pin Female to 1394 Type B 800 9 Pin Male Data Transfer Adapter Converter for MacBook Pro, Mac Mini, iMac etc - Walmart.com
Vintage Apple Macintosh PCI Sonnet Tango 2.0 Firewire 400/USB 1.1&2.0 Combo Card | eBay
Thunderbolt and the Mac: The adapters you need | Macworld