A few 'award winners', for nurseries, I can recommend.
Best selection of larger stock sized plants: Conifer Kingdom, Bloom River, Greer Gardens, Gee Farms(though they don't ship to Washington state!)
Best selection of gallons and under plants: Porterhowse Farms, Coenosium Gardens, Bethlehem Nursery, Conifer Kingdom.
Best quality plants: Western Evergreen Nursery, Coenosium Gardens, Conifer Kingdom, Bethlehem Nursery.
Best value plants: Western Evergreen Nursery, Coenosium Gardens.
For the rarest of the rare: Coenosium Gardens, Porterhowse Farms, Conifer Kingdom, Bethlehem Nursery.
My experience in online nursery hunting is, to be frank, very extensive. There are nurseries, of course, I have not purchased from, but these are really some of the very best to choose from.
Happy shopping!
-Will
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Japanese Stewartia
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