I usually include links to the suppliers of the seeds I grow or the original source of them. For many years I have been buying seed from Phoenix Seeds...as they don't have a web site I'll post their address here and put a link to this on my Supplies list.
Email Me for a PDF copy of their latest catalogue. Scanned with permission.
They offer prompt service and a very wide range of unusual vegetable, herb and tree seeds.
PO Box 207
Updated 10 July 2011 HERE
Updated 2012 to include link to website HERE