I was told that the Reef n810 phone cases are compatible with the ZTE Savvy? Is that correct?

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.

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 currently no available hard case for the ZTE Savvy. Wait for a few weeks. There should be something available by then.