Starting Over: App Suggestions?

[craigkeen]

I am having serious doubts about the seller I've been working with and unless he pretty quickly answers my questions about his credibility, I'm starting my search over. I don't plan to name names here, but right now I feel conned.

So, my question here is pretty simple. Are there apps that are particularly helpful in locating an early Boxster for sale, one that looks well beyond dealerships? I've Googled for what I have in mind, with no luck yet, and I've tried to search here, also with no luck.