I would simply like to find out where I could buy a professional
clapboard online in Europe. I did find a company that sells it in
Florida, and here's the link to that page:
http://www.studio1productions.com/clapboards.htm
What I want is the white Pro Clapboard on the left, or something similar.

Hello magicoctopus

This London company has a choice of professional clapboards:

Clapperboards.com
http://www.clapperboards.com/

I hope one of those will meet your needs. 

If you would consider a second-hand clapboard, see this ad:
http://www.mandy.com/1/class3.cfm?id=19174

I didn't find anything else except this cheaper alternative which
looks very like the black one on the studio1productions website:
http://www.otherlandtoys.co.uk/product_info.php?products_id=1085

Please let me know if you need any clarification. 
Otherwise, good luck with your film-making!

Best wishes - Leli


The successful search was on google.co.uk after selecting "pages from the UK":

film clapper boards
://www.google.co.uk/search?q=film+clapper+boards&hl=en&lr=&cr=countryUK|countryGB&start=10&sa=N

I also looked for any online discussion of clapperboard.com with this search:
://www.google.co.uk/search?q=%22clapperboards.%2Bcom%22&hl=en&lr=&sa=N&tab=gw

This was very helpful and saved me a lot of time and effort. Thanks!