Northeast USA supplier of native plants for schoolyard garden

I am on the hunt for these plants (live plants, not seeds) for a new schoolyard habitat garden...

Here's a little background:  

We've received a similar grant at the school where I teach and we are planning a lovely space for pollinators, birds, and bugs--a place for city kids to observe, learn about, and learn to love living things! Anyone know of good suppliers for the specific plants below? It's easy to find ornamental viburnums around here, but we're having a hard time getting the variety we want. We have been able to source most things locally but are stumped with these so far.

Sweet Pepper Bush  clethra alnifola
Cranberrybush  viburnum trilobum
Trumpet Honeysuckle lonicera sempervirens
Wild Strawberry fragaria virginaria
Joe Pye Weed eutrochium purpureum

Any leads would be most welcome, as would any advice from veteran schoolyard garden folks!

Kris

Also--is it silly to buy Joe Pye Weed plants? Should we just start from seed? We have a greenhouse.

Hi Kris,

Try Earthtones Nursery in Woodbury, CT:
http://www.earthtonesnatives.com

Or New England Wetland plants in Amherst, MA:
http://newp.com

-Matt