I'm in Seattle. We can get anything from 1:1::CBD:THC or 1:1:1:::CBD:CBN:THC. The concentration on those goes way down, depending on the potency of the flower. For straight THC stuff, 16% is as low as I can find, and that's usually indica strains. 30% and better is available, but most of our stuff sits in the 22-28% range, at least at my local shop.

I'm also someone who smokes a quarter of a joint, saves it, and I come back for more later. Potency isn't really the problem when I do it that way since I just stop when I'm high enough. :)