Save by buying a set! These sets of Nestabilities have the same dies as the individual packages. If you already know you want all four of the Nestabilities in the set, this is a great way to save! If you already have one or two of the dies in the set, then you can get the individual Nestabilities instead.
Please note that the circles are the same in two sets - the large and small circle Nestabilities are included in both the Petite Circles and the Standard Circles sets! That's the only overlap between sets.