The phone is unlocked and will be available for between $275 and $350 depending on what tier at which you back the project. Briggs & Spriggs says that phones are expected to be delivered to backers by October 2015.
That Boss phone looks to be sourced from Chuwi. And it’s so old, Chuwi doesn’t even offer it any longer.
And I can tell you that when they did, you wouldn’t have had to pay as much as this campaign is asking!