So far, I've purchased four hanging boxes and four rack packs. I believe you get more inserts by buying rack packs than by buying hanging boxes, but I'm a set builder right now so I'm happy I bought the hanging boxes. I traded 1/3 of my extras to Derek for cards I need, which is a good thing! I may need to pick up more rack packs to build some more insert stock for the sets I'm putting together. Hopefully I can work with trades to finish these sets, though!