Ped Eggs are available at your local Sears store.
In a side note, my heels got really nasty and started to split. I guess it was because I used to go barefoot a lot. The cracks went deep down. I just grabbed my belt sander with a 100 grit sandpaper on it and got busy. That worked quite well. As with ANY object that removes material, one MUST exercise some caution!!! BEG, you want me to get you some gloves for the next time you use that Ped Egg ??