Gita,
I checked with the grower, and he had reservations on whether they would winter over. His fear is that they would dry out. I have to wonder about that though as I lift my bulbs in the falls and store them inside all winter with no problem.
Also, No room in the garden doesn't mean no room for pots! We pretty much only put caladium in pots these days. Not only does it make it easier to lift them in the fall, but we move the pots around depending on where we need color.
Otherwise, yes, I still have some available.