Baja Arizona golf is seriously less expensive in the summer. You say "It's too hot!" Nonsense. Just keep your shirt wet and a wet towel handy and the breeze generated by riding your cart from hole to hole will serve as natural air conditioning. You'll have the course practically to yourself. And drink lots of water. Seriously though, the heat can be deadly dangerous, so go prepared and know when to call it a day.
Also, if you are able to play on the spur of the moment, this website offers excellent deals.