Kate, I don't know about availability, nor do I know what standard you are looking for with 'organic,' but
Guittard produces a number of fair-trade products for small-scale manufacturing (little gourmet chocolatiers, basically).
They are very definitely safe for PA/TNA, and they are also delicious.
As for baking cocoa, we have used Hershey's (which I don't love) and SaCo brands (which I do).
Neither is specifically organic-- the SaCo product is produced in Canada.