No, no phones for purchasing yet. They will, most likely, be available in the first half of next year. There are a few devices to test on for developers (https://developer.mozilla.org/en-US/docs/Mozilla/Boot_to_Gec...), but none are optimal for usage at this moment.

When it comes to testing, r2d2b2g (https://hacks.mozilla.org/2012/10/r2d2b2g-an-experimental-pr...) is the best option for now (and tomorrow we at Mozilla will talk more about its future on Mozilla Hacks).