craig's list might be your best bet.

Bamboo is painful to dig, and when I had to get rid of some, I posted here - you dig, it's free. I had quite a few takers.

Bamboo roots are huge, and I always thought the cost of shipping prohibitive to selling or swapping via mail.

There was an earlier post, currently towards the top of this forum about someone looking for bamboo.

I would love some of the black bamboo. Have you tried to dig up small portions/divisions to pot yet? My dad wants me to help him with his yard and he likes the look of bamboo.. Im by Sandy Hook Beach, NJ... where about are you? perhaps I can come by and purchase some from you?
Bronwyn

I have a huge area of bamboo on the Dismal Swamp National Wildlife Refuge. The size varies from new shoots to well established large bamboo. I know there are many uses, and this is beautiful green. If anyone would like to harvest and purchase, please contact me.
Thanks.