There is currently no available hard case for the ZTE Savvy. Wait for a few weeks. There should be something available by then.
I just purchased a ZTE Savvy C750 from Straight talk is there a case we can use to protect our phones till the new ones come out?
There is a couple of Holster Pouch Cases, listed in Where to Buy section on the ZTE Savvy page.
Once there will be more accessories available, they will be listed there also.