Hi there, I only know where to rent a car in Gazipasa airport in Alanya. But it is almost the opposite end of the shore. So better if you try to check out for more information in your region. Will be cheaper indeed.

If you ask me, I would assume, that the easiest way to get a good car is to book it online and get it from the airport of arrival. In Izmir this can help you get a model that you like. I would recommend you to check it out now, as sometimes in peak seasons people grab cars quite fast.