Brightmeadow, I did a short search and found these Links. Hope you are able to find it with Seed Of Diversity. If not check with the other Links I have listed.
Gary

Duane baptiste potato - Seeds of Diversity
seeds. The Bean is listed as available.
ca/hpd/cvdetail.php?species=Bean...Duane+baptiste+potato
5+ items �" Bean : Duane baptiste potato ... White, kidney shaped seed. ...

1999 Duane baptiste potato: [Bush, Dry] White, kidney-shaped seed. Hardy ...

2000 Duane baptiste potato: [Bush] Same as above

I have not checked any of the following seed sources.

Duane Baptiste Potato Bean B white bean native to the region grown for drying
Eastern Native Seed Conservancy, P.O. Box 451 - Great Barrington, MA 01230 413-229-8316,
www.enscseeds.org

Old Sturbridge Village Seed Store, 1 Old Sturbridge Village Rd. - Sturbridge, MA
01566 508-347-0270,
www.osvgifts.org Plimoth Plantation,

Plimoth Plantation Museum Shops, P.O. Box 1620 - Plymouth, MA 02360 800-262-9356 x 8332, www.plimoth.org Ron

Thanks for your information Ron.

I had contacted the Seeds of Diversity member who had it listed a few years ago and she no longer has it. Eastern Native Seed Conservancy no longer sells seeds and I can't see any seeds for sale at plimoth.org.

However, I have since found the seeds at:
http://www.synergyseeds.com/ George has many interesting and rare heritage seeds so I have ordered more than just this bean from him. From what I can tell, this catalogue is the only one offering this heirloom bean and I have found some articles claiming that it is extinct. It is so exciting to find it!

Brightmeadow