Here is a place in Tennessee that you can order salt rising bread on the web:

http://members.aol.com/lawsonsbak/

I've not yet ordered. I was just shopping the web for it myself this morning. I grew up on a tradition of Sunday breakfasts with broiled salt mackerel and this bread. I have a local bakery that makes the best I've ever tasted, but there is not enough market for it and he doesn't do it very often.