This was recently discussed on another thread. Might wanna check that out:
http://forums.gardenweb.com/forums/load/hosta/msg0712573627964.html

Here is a link that might be useful: Mail Order Hosta Thread

Hallson's!!!

Here is a link that might be useful: Hallson Gardens

Northern Grown Perennials....Ferryville, WI
Huge roots, field grown plants. And Rod is always helpful if you have any questions.

You may want to try NH Hostas. It's in South Hampton - just over the MA-NH border off Rt 95. It's also a great place to go in person.

Thank you all for the information. BorninMaine, I will look into South Hampton.