Looking at the video introduction with the Flipper Dunk demo, I assume those "balls" are unique items and the players can not own more than one per model (i.e, can not own 2 penguin balls), is this called "non-stackable"? Right now, no matter if set an item to stackable or not, I can purchase more than once. Does anyone have the same trouble I am having? Thanks a lot. Really looking forward to the final release of Game Foundation, it is really cool.