A while back when I blogged about beauty supplies (I <3 all things beauty supplies), I raved about a product called Living Proof No Frizz. The more you use, the better it works. Well, considering it's $24 for 4oz, it's not very practical for my humble teacher's salary.
I found an AWESOME, CHEAPER, BETTER alternative: John Frieda's Frizz Ease Straight Fixation. Not only is it $5.99 for 5oz. but you only have to use a dime sized dollop. It works wonders. I accidently straightened my hair before checking the weather (believe me, this is an awful mistake, lol) and when I went out, it was drizzling (gasp!) and I had no umbrella (double gasp!). Amazingly, my hair stayed perfectly straight and there was no halo of frizz on the top of my head. This one is a keeper in my beauty arsenal!