EDIT: an awesome video made by Grant Baldwin (from Clean Bin Project) - The Soap Dispensary
Love this: The Soap Dispensary - they have a number of products that you can bring your own containers and re-fill. Seriously, awesome! I've been waiting for a place like this.
I use the Dr. Bronners Castille soap and that's one of the items they have! I can see I will be making many a good trips here. I may never have to buy a plastic bottle again!