you might get better responses if you change 'of' to 'for', since you're looking for a case FOR your camera, not A case OF the camera. I realize English is not the first language for many people on here.
A 'case of' a product is usually a unit measurement. You would have several units for sale within this larger box, the case.
Whereas you are looking a 'case for' a product, which usually means a protective shell or pouch.
I personally opened the message thinking it was someone talking about finding several of the units fresh in stock, like a surplus of them, indicating the camera would be on discount sale somewhere.