Not sure if anyone's producing these at the moment (grahf was doing these for awhile, right? I haven't seen him on these boards so much since he went to Japan...)
If you, or anyone you know, have the know-how, you can build one yourself with a few IC chips:
http://mbrandel.vizionaires.net/?page_id=48The other alternative is bypassing the PCB board altogether and using a 8PDT switch -- little more straightforward (not saying much), but the switch options are a lot more limited. Actually, I think these days, the only 8PDT switches that'll suit the bill is this long pole switch.