By searching around Sprint's website, it seems that they are no longer marketing the Evo 3D.
My question is: "If I'm paying insurance for my Evo 3D and something happens to it, what are my options as a replacement?"
Typically, there is ample inventory for replacements either for warranty issue or damage on device through insurance claim even when device is no longer being sold.
You have two choices, either turn in you current phone under the insurance claim and they will send the same model of phone back to you.
Or buy a new one if your contract is up for renewal and trade the old one in for a credit.