Most dedicated owners who have had the iguana for some time turn to custom made enclosures with glass doors and a combination of screen and wood to help balance heat and ventilation. Regardless of the style, you choose you must have one that is escape proof, unless you don't mind finding your iguana in odd places. It should have a lock on it. If you decide to go with an aquarium-style enclosure for the time being, you have to be sure that the aquarium can support the light structures needed for the iguana. As for items in the cage, you should have a ceramic feeding dish.
Iguanas like to climb so having tree branches are also a good idea to have in the cage.
It is essential that you look at all the considerations before buying a reptile. They are delicate animals that require owners who are sensitive for their needs. When in doubt, ask questions and research the animals before you buy on impulse. On the plus side, when given the adequate care and attention, iguanas can be wonderful pets. Find out what is involved in pet iguana care and how you can be the best owner.