Back to Basics Straightening Shampoo and Straightening Conditioner...they're $20-something each (depending on the salon...amazon usually has them cheaper), but they're giant bottles and last forever. No frizz with this stuff, even in Houston summers.
Imagine my surprise when I found both at the Tuesday Morning on 1960 for $9.99 each.
If you have naturally wavy or semi-way hair, but wear it straight (with an iron), I'd highly recommend this stuff.
I think the store brands work fine on some hair, but tend to be really drying on other types. I can get away with them in the winter, but my hair is a hot mess with them in the summer humidity lol 4951