How to screen record on my iPhone 4S and my retina ipad?

No jailbreak. I don't mind paying though. Is there any way?

I don't really think that you can screen record without jailbreak and i don't think that there are apps that let you do that.

No. You have to jailbreak. There used to be an app called disp recorder, wich would record your screen. Apple took off the AppStore.