Building extender boards -- finding protoboards w/edge connectors?

Hey all-- I'm going to need to build an extender board or two for my Imlac in the next few weeks toaid in debugging. (Now that I have the power supplies up and running, there are a lot of stuck bits here and there in the CPU and it'd be really, really useful to have easy access to the chips for testing.) The cards have an 80-pinedge connector (40 pins per side) with a .125" spacing (same as S-100). I figured I'd look fora source of prototype boards & edge connectors with .125" spaced fingers on them and build a couple by hand, but I'm not having a great deal of luck finding the boards. Digi-Key comes close in that they actually have S-100 prototype boards listed, but of course theyhave none instock; this - http://www.digikey.com/product-detail/en/4610/V1111-ND/146808 - is close but has too few connectors. I suppose I could track down an S-100 prototyping / extender board and hack it down to the right size but I'd rather not destroy something. And since I'm only going to need one or two of these I don't see a lot of sense in having some fabricated. Any suggestions on where to find parts for this project? Thanks, Josh