Theresa,
Mamajacks is on Cubits, and the other co-op, the Woodthrush one is the link Susan gave above. Of course I love Mamajacks, but she has a greater variety than the Woodthrush one that specializes in hostas. The hostas in the Woodthrush one are from good vendors like Q and Z and Walters Gardens. They are small, yes, but small in price, also, and I have never lost one.
I haven't tried out Countryboys, but will surely do so. Thanks Susan!
As far as coneflowers go, I think there are just some plants that need to be purchased in larger sizes. Starter sizes are not for everyone, and even retail vendors have trouble with coneflowers. But those starter hostas are easy to grow.