Its best to get them as eggs in order to insure that it will be with you for a decent amount of time. If you order an adult cuttlefish, you never really know how long you'll have it. Could be two weeks or two months. I'd check out tonmo.com for more info about them. They have a cuttlefish availability thread thats updated from time to time to let you know where you can get them. I'd find out as much as possible before getting one though as they are more of an advanced animal to care for and they do require largish tanks.