Here's another source for geophytic seeds...
http://www.arilsociety.org/index.pl?Seed2010
The Aril Society International is having their annual seed sale. Arils are
irises that love arid conditions are naturally found in countries of the
Middle East and Central Asia. They grow well in other climates if given
proper care. I've had great success with hybrids of arils and "regular"
bearded irises, here in Cincinnati.
To order, send your list of items to the seed chair (hoepfner@privat.dk) and
he'll instruct you how to make payment.