Alot of grocery stores have peanut butter machines. You add the peanuts, hit a switch, and they get all mashed up for you. Thats how I buy PB these days. They taste REALLY good that way, and you don't get all that oil floating to the top because its freshly made.
However, the peanuts still probably have some salt added, so they aren't 100% peanut, but pretty darn close.