Where Would I Buy Rare Bushes?

Question

Specifically a creosote bush. I live in New England so I can't just drive to the desert and get one.

Answer 1

Some nurseries have exotic sections in which they carry things like this.  Go to some of the bigger nurseries in your area and see if they sell them.

Answer 2

I'll usually search around on E-bay for rare plants and look at their stores and I can sometimes find what I want.  Another good thing to do is maybe join a plant or seed traders group online and someone may be willing to swap one for free for something you may have.  One such site is www.gardenweb.com.  I belive the membership is free and it lists each members wish list and what they have available to swap.