Good drugstore flat iron?

I'm looking for a good flat iron that can be found at places like walmart, target, walgreens, and cvs. I don't really want to spend a lot of money on it, so no Chi or any other pricey ones. Try to keep the price limit under $50.00. My hair isn't bad at all its just that I want it to be a little more straight than what it already is. It would also be nice if it could make curls well too. :)