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Look into either the new flex hairspray by living proof or the bumble & bumble Does It All hairspray. They both serve as heat protects and as a styler as well. I believe Alterna has a few products as well. Check out sephora online for more info.
I flat iron my hair about twice a week with a Chi, and I use Tresemme heat protectant spray. It is inexpensive and seems to work very well for my hair.