A friend of mine is selling seeds this year from a plant called 1,000-year-old tobacco. These seeds were apparently found in a
native burial site in Michigan. They were in some pottery that had been sealed with pitch and they were really
carbon dated to about 1,000 years ago. Someone got them to germinate successfully and has been propagating the seeds. My friend grew them last year and they are the strangest, most beautiful-looking plant. They look almost prehistoric. This is in Canada and I am not sure about the logistics of shipping over the border, but I love the idea of spreading this beautiful heirloom ceremonial plant. Here's a link to his website:
http://www.annapolisseeds.com/page_32.html