Season 2 when?
Not for at least another year probably. Bones has a pretty packed schedule. Shueisha has no reason not to commission an OVA or something in the meantime to keep the fans interested though, I'm not sure what they're thinking.
You have to buy them for now. I'm in the process of scanning some of the volumes but real life keeps getting in the way and my translation skills are atrocious anyway.
Speaking of, the first volume of B2B releases either today or tomorrow.