Restrict permission to the SharePoint store

Hi!

I don't want my users to add any apps from the SharePoint store. I can stop them from installing, but they can still see the link to the SharePoint store, browse around and see the message "Sorry, apps are turned off. If you know who runs the server, tell them to enable apps." This is absolutely not what I want, there must be a way to restrict access to the SharePoint store?

Regards,
Helena