I was told to try Watson's in Puyallup or Portland Avenue Nursery in Tacoma as well as Swanson's in Seattle supposedly has a huge bulb selection each fall as well as offering the growing starts in spring. The Washington Arboretum fall bulb sale is also an excellent source for a wide range of bulbs, including many less common types.

Also that snowdrops might be best transplanted while in the green in spring.