I can only answer for in the UK, Christina, but over here there's lots of things that are online that we can't get instore ie. many of the adult clothes, jewellery, snowglobes, household items ..... so I'm assuming the store in Paris will be the same?
I'm hoping to get a mini Paris snowglobe, I'm hoping they'll have one because I bought a Rome one last year. I also bought a Rome mug and coaster set (of which they also do a London one but I can't see it on the website at the moment) so hoping there will be a Paris one as well.
Looking at your ticker I'll be going in there before you so say if there's anything you want me to specifically look out for.