Arizona Members May Help?

At this point I am getting serious about finding a rear end for my 73 Dart that has a trac loc or other type limited slip function.
Anyone have something reasonable they can part with?
My original plan was/is to pull one from the local yard and mod it, but if someone has something laying around and can use some Christmas money I'd rather do that.

Want to keep it local to avoid shipping that soaks up some of what I can pay.

Thanks