I noticed my rotors are starting to rust already, what are a decent set of rotors that wont rust at a good price, thanks I have a 12 mustang gt

 

err drive it and brake, the "rust" should come off. if it isn't on the surface of the rotor don't worry about it.

 

Nobody makes rotors that don't rust. Some make rotors with the edges zinc coated or painted and that holds the rust at bay on the edges for a little while. But the main surface will rust every time I wash the car. Of course pulling it into the garage afterwards and the rust is gone.

On a purely academic note motorcycles often come with stainless rotors that don't rust. And even cooler I had some metal matrix rotors which worked great, made from aluminum but silicone carbide mixed in. They weighed half what an iron rotor weighed and didn't rust or seem to wear as the carbide is harder than the brake pads. Lotus sold the original Elise with metal matrix rotors but stopped for some reason. I haven't heard anything about them since. I wish they'd get going with the carbon ceramic rotors good ones will last the life of the car never rust and weigh half of steel while being 50% bigger.

 

Your lucky, these guys on this site have taken it very easy on you for such a question.