Ikea CHARM Pizza Cutter Stand/Guard
This is a rounded stand for an Ikea CHARM Pizza cutter. It may also fit the newer STAM Pizza cutter, but I haven't tested it, let me know if it does.
If you reduce the size of the interior slot just slightly (or don't clean it out with a file) it will friction fit the blade and work as a blade guard (require two hands to remove). If you clean out the inside with a small needle file you can remove the pizza cutter from the stand just by lifting it out.