try mail order natives

Here is a link that might be useful: http://www.mailordernatives.com/servlet/StoreFront

Missouri Wildflower Nursery. They're a top-notch company; I have bought both seed and plants from them, both pickup and mail-order.

Their online catalog shows that they have just sold out of serviceberry... but I think it would be worth a call just to make sure.

Phone: 573-496-3492
Fax: 573-496-3003
E-mail: mowldflrs@socket.net
Website: www.mowildflowers.net

Forrest-Keeling also has had native serviceberry, but I'm not sure if they'll mail small orders. http://www.fknursery.com

I'm not sure you're aware of this, however it really helps if you provide your state and zone when requesting information. For instance, I live in z5a IL (indicator of my being in the northern part of IL) and I would never buy from a source in TX. Too warm and a very different climate that for me to expect it to survive here.