If you go to the website http://www.pccard.co.uk/adapter/index.php you should be able to get most of the information you need. I seem to remember that I had to email them to get prices before.
The module I bought (P223) has now been superseded. I bought it a while ago and I think it cost about 120 GB pounds but I can't be sure because I don't know where the receipt is. It has a card that plugs into the PCI bus and provides two front mounted PCMCIA sockets. I have successfully flashed an old Irdeto CAM to 4.6SE, 4.7SE, Freecam 2.017 and Freecam 2.018.
If you search Google for something like "PCMCIA desktop adaptor" you will find a number of other options.
[updated:LAST EDITED ON 12-Feb-02 AT 10:51 AM (GMT)]Another link for PCI adaptors http://www.prestico.com/products.htm This one used by TheBadger on Phill's forum, he uses the ISA version. The only thing I would add to this is that it is possible to buy old PI Laptops for around the same sort of price.