Can anyone suggest a good screen protector besides ifrogz?

Hello, I have the iPhone 4 with an ifrogz case. I went to best buy, and bought ifrogz screen protectors. When I got home, I put the cover on then went to put the case on, and the case pushes the screen protectors off!!! I have no loyalty to ifrogz products, they were just the first things I saw. The screen protectors were a waste of $20 since all three of their stickiness wore off from trying to get them on right. Thank you.