I had never seen this site before, but Pfeifenstudio Frank has a great selection from European pipe makers, especially ones whose work doesn't often make it to this side of the pond. The prices on some makers' work aren't bad, either, and a bit cheaper than you sometimes see here in N. America. Even if you're not buying, I had fun just scrolling through the galleries for guys like Kai Nielsen, Peter Matzhold, and Axel Reichert.
http://www.pfeifenstudio-frank.de/
http://www.pfeifenstudio-frank.de/