Buying e-cigarettes in Brussels?

As far as I know they are banned from sale in Belgium, however I see them all the time on sale at Relay's and such. But they are the cheapo disposable ones that aren't much chop.
I am yet to see a place where you can buy juice or proper cartos, etc...

Online is by far and away your best bet.

YES! I just saw a shop in the Louise Gallery. Not sure exactly where, the place is a little maze-like, I think it was maybe near the Louise exit? Browse around, there's definitely one there.

Careful when buying, as the e-cigs themselves are not illegal but nicotine is so you don't want to end up with a pack of 0% nicotine.

As a previous poster said, there are plenty of good internet suppliers in the UK, NL etc who sell 'the real thing', and delivery is usually 2-3 days.