Pro sites and Marketpress, Hide Items from unpaid prosite?

I have both Marketpress and Pro Sites to crate a type of marketplace website.

I make shop owners pay to run their shops on a monthly basis. I set up pay to blog within Pro sites to accomplish this. But if their subscription runs out then their items will still show up in the global items lists within my website and their shop will still show up in the buddypress site directory.

Is there a way to disable items of a pro site if their subscriptions run out and remain unpaid?

And can I hide unpaid sites from the sites directory?