I have two IBM Model M terminal boards for sale. Both are in pretty good shape. I have cleaned up the 1990 one inside and out (datavac, denture tabs etc.)
Of course these are terminal boards and won't hook straight up to a modern pc but it is possible to make it be able to. There is only 2 of these on ebay right now both priced at $65 and no where near the condition these boards are. The person I received them from also said they were tested on an AS400 about a month ago.
Let me know if you have any questions and I will try to help but I am sure they are other people who know a lot more about these boards than me!
So I will say [strike]$70[/strike] 60 OBO on the clean one and [strike]$65[/strike] 55 on the dirty guy. Includes shipping CONUS. I will ship international as well.