I would like to do a mass planting of Stella. Anyone have a suggestion where I can purchase Stellas for a low price?
I'd try here
Here is a link that might be useful: Valley of the Daylilies
I've dug up tons of Stella lilies over the years, they spread like crazy - maybe check your classified section to see whether anyone is giving some away or put in an ad asking for some.
Stella needs to be divided every few years for best bloom. If you see someone with big clumps, I would approach the person about getting some plants (perhaps offering to help divide or offering a small amount). You would be doing the person a favor.