Elizabeth, I've seen these anemones in white, blue and pink/purple. I have planted blue ones, but they don't seem as vigorous as the white. I don't even recall if any blues bloomed this past spring.
Cal, I've purchased them from Brent and Becky's Bulbs, but I think many places carry them. I believe each bulb produces only 1 bloom, but they have slowly multiplied for me (so not out of control).