When looking at the Bdop Cycling web site there is quite a bit of info describing that a long spindle is needed to use that btm brkt.
Each cup adds roughly 10mm in width which means your crank axle must be at least 88mm long > 68mm +10mm+10mm=88mm.
I suppose that info wasn't there when the O.P. was making his initial hunt.
Seems like some of the "purists" here, (and maybe I'm one of them) is getting hung up about the true definition of a BB30 crank set. I ride Cannondale and BB30. I tend to believe that to use that label your crank set better be able to fit in the traditional (68)mm OR (73)mm wide MTB shell. If you're crank spindle is so long that it uses outboard bearings then I consider it incorrect to call the crank set a BB30 crank.
So if your bike has a shell that is; BB30 / PF30 / Specialized 2013 OSB with NO outboard bearings, call it BB30.
The term has been bastardized by so many vendors who want to use the term.
Speaking of Specialized, what's up with them for 2013? The tech in my LBS said the shell in the 2013 Tarmac is slightly different than the normal PF30 inside diam. He said it was changed to a standard inside diameter dimension that is NOT PF30.