dont show pro-sites on certain blogs

I know this is a double post and thats probably against the rules but i really need a answer to this ASAP.

On my site i have a service called website in a box, these 6 different products have been built using templates.

I also offer free sites with the option to to upgrade them to premium/ultimate.

My issue is that pro-sites effects all sites not just the upgradeable ones, so i am looking for a way to exclude the website in a box products from pro-sites?

Regards
Peter
Composite UK