In about three weeks time I’m going to be in Gent, Belgium, for the diamond-wedding (is it called that? If not; 60th anniversary) of my grandparents. I’ve searched around a bit, but haven’t found a shop for circusstuff. If anyone knows one, I’d be grateful to know.
It might be worth your while to email this guy.
These guys also operate in Gent and might have more information.
Here’s a list of all the Juggling Clubs in Belgium.