All of the above is great information.
I got my first crested at the Phoenix expo you will have plenty of choices and will definitely be able to find food from a vendor. A lot of vendor will give a free 4oz bag of CGD with your purchase.
I wouldn't put a crested gecko in a heated room. It's better to have them too cold than too hot.
If the tail drops it's no big deal, just make sure that the open wound doesn't get infected. You shouldn't have a problem with that since you will be using paper towels.
You will be able to get an unsexed hatchling for a better price than an adult. I personally found it awesome to see the color change from 4 grams to 30. I would go the hatchling route, but both are equal for care requirements.
Here is a link to the progression of color change my first crested gecko made.
http://www.pangeareptile.com/forums/...ad.php?t=53513
Enjoy, crested geckos are an amazing species. They are so easy to care for and have great personalities.