I'm thinking about getting a 3GS phone, and wonder if I can Jailbreak it if it comes with 3.0 firmware? I understand Apple stopped signing 3.0 firmware, so I'm concerned I can't do a backup and jailbreak it.

I know if the phone comes with 3.1 I'm screwed until/if a Jailbreak comes out. But it's not clear to me if I get a brand new 3.0 3GS if I'm toast or not.