I really do not need a case, but just a soft touch back to make it less slippery. Is that available?
I found and bought a faux leather one, exactly the same kind I had on my S3. Search eBay for a leather battery cover.
Look at the S4 accessories on this page, especially the "Surface" back plate with their "soft Touch" coating.
They only have cases, this is not what he wants. He want a battery cover.