Temporarily hiding Supporter pages

We'd like to have the Supporter framework in place, but temporarily disable the links to the Supporter signup while we work on our business plan for that aspect. In other words, we're just using the ability to disable certain plug-ins for non-supporters, and manually setting up who we want supporters to be.

Now, I can easily disable the link on signup, which is great, but that leaves the link in the admin bar. Also, I don't know what happens when those prices are set to $0. Tips? Obviously can just go in and hack it...