Shipping on a board from the States to Europe will typically be 30-40USD, so it would be wise to look locally.
Ebay UK and Germany very often have some good used stuff floating around. You have to watch carefully because the names used are often different from goods in the states, for example Apple Extendeds usually are just listed as Apple ADB Keyboard on the German ebay site and you have to search through for the good old ones.
The IBM Ms go for a bit much on European Ebays, its actually often cheaper to ship from the states.
Most big cities have a university of technology. Just walk in and ask a couple students where the computer rooms are for students, and there you'll find someone monitoring the room who can tell you where the IT guys are. If they like you maybe they'll sell you some of the "junk" piled up in the corners.
I posted an advert on a local Linux forum that I was interested in old keyboards and walked out of a garage carying over 30 boards for 40USD, while many are good only for parts, most of them are really old and good Alps white, yellow and blue style switches. Try posting and see what you get. Just don't pay too much and avoid terminal boards or XT style boards (test on your laptop with a good ps2 -> USB converter before buying is the best policy)
European Cherry switch manufacturing is based in Germany and Czech, you can often find some of their new boards with browns and blues, but usually with a German layout. There was a link in a forum here for an Austrian distributor who had a pretty good one for around 80EUR.
Try a WTB (Want To Buy) in the marketplace forum and maybe someone will have something they'd be happy to pass on to you. I'd be happy to sell you one of the many boards I picked up once I get a couple of them working... I still have to swap some bad switches.