Brake Pad lights came on

[AlphaKennyOne ///M3]

My brake pad lights came on.....now I have been lagging on doing this for almost a month now (since I hit a boar up Mt. Hamilton about a month ago, but that is a different story). Anyways, my question is about my brake pads.....when I got my tires changed about a week ago, my brake pads looked like it was doing alright....my brakes squeek a lot though, but it's only a quiet squeek. Anyone know where I can get those euro floaters at?....how much will it cost for the rotors and pads to get installed or can I do it myself? How much are pads?

Thanks for the help!