OT Karyn - Matelea Seeds
At Bluehill Nurseries they gave me two websites that you might want to check out. They sell a whole lot of various seeds. They told me that it might be totally possible that the Matelea Seeds are mixed in with other seeds in a package that is being sold as bird seeds.
I hope that, if you should decide to contact them , they might at least be able to tell you where you can find the seeds you want.