European sites:
Alpha-Crucis (ch)
Antarek (be/nl)
Evola (fr)
Farnell (uk)
Floris (nl)
Gotronic (fr)
Lipoly (de)
Lextronic (fr)
Maplin (uk)
Reichelt (de)
RS Components (uk/intl)
Snootlab (fr)
Zartronic (fr)
If these sites have bookmarkable language selections, the links above are to the English language ones. The Lextronic language selection does not work, its always in French regardless of which flag you click. RS ship from various locations worldwide (note to US readers, RS Components is unrelated to Radio Shack).
Postage varies between these suppliers, depending on their policies and on whether you live in the same country or not; minimum order quantity also varies. Most let you order either in Euro or in their local currency if that is different (ch, uk).