There's another site with a breeder selling SFV OG Kush. The plant and smoke are supposed to be top notch and a lot less expensive than Dr's. I don't know if it would be any kind of violation to post it here but since it is a site that also has forums maybe I'd better not. PM me if you want it.
And I think Hobbes is right. But we're getting to the point in time that these cali kushes have been around long enough that breeders are isolating the mother strain after I guess having crossed it with some other male pollen. At least I think that's how they do it. But it's available.