Thanks William! C. quamash is very inexpensive, that clump is 100 bulbs for about $15. Being so dainty, I'm really loving the mass effect. I'd tried them in little clusters here and there in the past, and that made little or no visual impact. The taller species are significantly pricier, but I think the added height would make a clump of 5-10 bulbs enough to create an attractive grouping in the garden. They are very graceful, and the form contrasts nicely with other plants in the garden.
I keep thinking if C. leichtlinii Semiplena is still available when the clearance sales start, I might bite... 'Blue Heaven' is really lovely too, and also tempting.