For those of you who plan to visit Europe here is compiled a list of sources (organizations, publications, clubs, forums, etc.) in various E.U. countries...
DENMARK
http://www.spor0.dk/da/klubber.html
FRANCE
GERMANY
http://forum2.argespur0.de/forum2/viewforum.php?f=9
http://www.busecker-spur-0-tage.de/1.html
http://www.spurnull-magazin.de/
http://www.fremo-net.eu/moduls...oesse-0/0-regelspur/
LUXEMBURG
NETHERLANDS
http://home.kpn.nl/rkievit1956...weekeinde/index.html
SWITZERLAND
http://www.fremo-net.eu/moduls...ur-0-in-der-schweiz/
UNITED KINGDOM
http://www.classicogauge.net/forum/index.php
Sorry, if dealers/retailers/distributors/manufacturers are excluded, because I tried to avoid overloading this list with adverisements. Also Z, N, TT, HO, S, 1, G sources are excluded from this list.
This list is just attempt to map specifically the European coarse scale O gauge (vintage and modern tinplate) and O scale (1:43,5 and 1:45) situation, which can be extended by any forum member, if you happen to have some more European sources.
Please, keep in mind to get in contact with the mentioned clubs in advance and ask for an appointment, because most of them are small clubs in private premises with irregular opening hours. Some of the clubs attend at scheduled public events during weekends.