Making peanut butter at home is awesomely easy. Well, as long as you have a food processor or blender. Otherwise it is quite a task and you are probably better off buying a jar. Just look for the natural kind without all the added sugar and extra oils.
If you can make it at home you’ll have the best peanut butter around and it only has two ingredients. One is peanuts (crazy, I know!) and one of them is salt! That doesn’t even really count as an ingredient in my book.