I don't know how rare some of these are but I'm told they are: 1) Original Mark-8 board set. (Think there are less than 20 Mark-8s/board sets out there currently) 2) Tektronix 6800 Board Bucket (probably even less than above?) 3) Digital Group Z80 and 8080 systems + 2 cassette Phideck 4) Videobrain Family Computer
Am envying the Altair guys though. I want one but they always come up at just the wrong time.