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My family had several anoles for a long time, two males and a female. The males would get somewhat territorial, but they never hurt each other... they'd just stalk around and wrestle a bit. Eventually one became dominant, he & the female mated, and everything was peaceful.
I wouldn't buy one from Petsmart or any chain pet store. If possible I'd look for a local reptile shop. It depends on the specific store, but many of the chain store locations don't take proper care of their animals or they have diseases/infestations.