This started with my back battery cover starting to crack. I was told by online chat that you have to call to get a replacement. So I called the following number 832-204-1118, and got it for $15 plus shipping. Providing the rest of the information below for parts and accessories that also go with an Evo 3d. I know they aren’t being made, but they are still a pretty good phone.
This protector is a bit pricey, but well worth it. If you do get it, then you’ll want to purchase the case/carrier, docking station, and perhaps the car mount.