Amazon.com: HTC Evo 4g Replacement Touch Screen Digitizer Lens Part: Electronics
Usually thats the cracked part. If it is the whole screen, you are better off with just connecting the new one as far as cost. If you really love your old phone and dont care about the money, you can take the screen off the new one and put in one the old one assuming they both take the same screen. If you didnt know, EVOs have 2 different screens.