Players can have a total of two dance floors (depending on the level you are on, you might only have access to one).
The first dance floor is in the shop until you purchase it as part of the initial tutorial. Once it has been purchased, it is removed from the store. The second dance floor is available at level 15. Once you purchase it, it is removed from the store.
Having two dance floors allows you to try for you next bunny twice as fast!