American Meadows has several varieties

Kitty - 'Daisy' is a little vague. Are you thinking Leucanthemum superbum (Shasta Daisy)? The basic white, perennial daisy? Are you thinking about seeding a large "wildflower" area?

Sorry, I am looking for the common daisy - Shasta Daisy the basic white, perennial daisy. It would be a plus if I could locate the variety that withstands high heat. I believe I read that it is called "Becky."

That helps! You won't find seed for Becky, it is propagated by division/cuttings. I would stay away from any of the dwarf, F1 hybrids, as they are very expensive. Probably something like 'Alaska' is going to be your best bet. That said, I deal with wholesale sources, so I'm not much help for you for a mail order source. Try Park Seed, ask for a quote on bulk (don't let them give you a packet seed price).

Or are you looking for the wild variety? There are several outfits selling wild flower seeds and it is possible to get the in bulk. Why do you want a pound of them (thousands of seeds)?