It kind of depends on the book, Cindy. Which ones were you looking at? The two American history ones, and the Greek and Roman ones, differ mainly in the addition of maps, pictures, timeline and reading list. The other ones Nothing New Press has done have more major additions and editing. I just like the looks of the Nothing New Press additions and did pay the extra $ for them, and am especially glad for the ones like Middle Ages and Ancient World where there was significant input by Christine Miller to make a book that is more useful for me. But if the money is really a concern and you were looking at one of the others that the additions were less critical, I think you could do just fine with other editions.