I have seen this plants in the plant nursery section of home improvement store like Home Depot and Lowe's. I also believe Pike Nursery has them in stock too. I would call before I made the special trip too a store just make sure.
A little shop of horrors! ;) Actually, any good specialty plant store that has succulents and exotics would probably have them. A pet store that has tropical lizards and exotic pets might also carry them.