Source for 2.54mm 40-pin connector shells

Hey, all, I'm looking for a source for 40-pin connector shells (to hold female pins) for 2.54mm so-called Berg or Du Pont connectors. Anyone have a source they can point me at? (I would call these male shells - since they go into the female shells with male pins typically found on circuit boards - but I gather the terminology is somewhat confused.) The small ones (1-10 pins) are easy to find (they are used for audio/USB connectors); the 40-pin females for use on ribbon cables are also easy to find, as are the males that go into PCBs... but the 40-pin insertable pin females appear to be unobtanium. (I want them because a number of old DEC interface cards use them for cables, and I refuse to pay $139 or whatever for a cable that's made of a total of a couple of bucks worth of parts - I'm quite happy to roll my own.) BTW, to quickly introduce myself (since this is my first message to the list); I did a lot of work with PDP-11s 'back in the day', both as a software development environment (using PWB Unix - roughly V6 - and later Ultrix), as an application platform (multi-protocol routers, using LSI-11s), and also some prototyping of high-speed network interfaces (1 and 10 Mbit/second rings). I now have a couple of 11s (a 23 and an 84) which I'm trying to get running. You'll be hearing lots more from me Real Soon Now as I get into that project... :-) Noel