If you are thinking about getting a Great Dane, please do your research before purchasing a puppy. Great Danes are NOT for everyone!
Find a reputable breeder in your area, meet as many Great Danes as you can, read books, go to a dog show (even if you have no interest in showing) etc. The buttons to the left will bring you to some links that may help. PLEASE do not buy a cute puppy on impulse. Get to know the breeder first, learn as much as you can about the parents of the puppy. See proof of health testing (button on the left) and ask about any other health issues (bloat, allergies, cancer... things we can't test for yet), ask about temperament or see first hand. Once you do all that and get your first Great Dane pup..... it doesn't stop there. You must socialize and puppy and obedience classes (button to the left) are highly recommended.
Even if you just want "a pet" it doesn't mean you should get a pup from anywhere and structure is also just as important as health and temperament. In the long run, you will have a much longer lived companion.
If you are interested in a Great Dane but don't want to start with the cute bouncy puppy you can always look into Rescue. There are 1000's of Great Danes in rescues all over the country. Reputable rescues will match the right Great Dane with the right homes. You could also foster a Great Dane. Volunteers are always needed.
If Rescue is not the way you want to go..... Here is a great link to check out to start your research. ABC's of Buying a Pure Bred Puppy and PLEASE do not get your Great Dane from a Pet Store, Broker, or Puppy Mill.