I found out about this slick Commodore 64 iPhone App from Jim at the best time: when it was free. But it's going to stay free now, it turns out. When the publisher moved this App to a free daily promotion, they saw such a spike in downloads that they decided to keep it free forever. Nice.
Of course, you can pay for extra games in the in-app store. That's probably a better way to make money on this anyway. If you're cheap, there's still free games included and more to download. And the paid games are pretty cheap; usually $0.99.
C64 has now topped 1.5 million downloads. Because of this, Manomio is planning an update in which they'll "introduce a huge number of very nice games."
C64 iPhone app to stay free, huge update coming [Pocketgamer]