I go to my health food store, "Good Foods Grocery" - it's a chain. They have a whole section of organic nuts that you grind into butter, put in your own container and label yourself. And despite the quality, it's still fairly cheap because nobody had to process/package it for you. My new thing is sprouted peanut butter. Less saturated fat, more protein, easier to digest, and tastes better.
Before I found this place however, I just bought Organic Smuckers - no sugar added; just peanuts and less than 1% salt. Why bother with other "natural" PB brands that have as much as 3g sugar per serving when Smuckers is just as cheap and makes such a quality product.