Showing Admin Ads At Different ProSites Levels

Is there a plugin or method that will have the effect of allowing me to show a different ad in the admin bar, based upon the site or blog level in ProSites?

Example, free level bloggers get an ad pitching the benefits of upgrading to Pro Level #1, while Pro Level #1 bloggers get an ad pitching the expanded benefits of Pro Level #2 and the Pro Level #2 bloggers get their own ad encouraging them to upgrade to Pro Level #3, and on and on.