If you check out Craigslist, Portland Oregon, and do a search on "Marijuana for sale" you'll find several people offering seeds, but I don't know if any of them have autoflower seeds. I think you'd be more likely to find seeds in Oregon rather than in Washington, because Oregon has made it legal to grow four plants, be it for medical or recreational reasons.
It seems like autoflower growers in the Pacific Northwest should be starting some sort of seed exchange for people that produce their own regular or feminized autoflower seeds. I don't know exactly how to set a seed exchange up, but the Portland Craigslist would be an excellent place to get some interest.