I am looking to buy a few of these AMD Geode NX DB1500 development boards:
http://www.amd.com/us-en/assets/content_type/DownloadableAssets/31760b_nxdb1500_pb.pdf

They are mini-itx, with 1ghz+ processors that use very little power.

yet I can't find them for sale anywhere, and AMD distributors usually
don't know what I'm talking about.

I'd like a contact who I can go ahead and purchase a few of these from, for
their normal price or less (i.e. <= $600).

This company has a good computer deals and I am sure they can help you
with the issue you have.

http://www.tarktech.com/Computers.pdf

Contact them and see what they can offer.  They seem to be an
experienced company and in business for more than 10 years.

Hope they have your boards.

Cheers

N Bridley