A quick search on Taobao, which is the Chinese equivalent of Amazon, has thrown back results that number in the dozens, where the different kinds of cases would be available from the most affordable which will cost approximately $0.26 cents (!) after conversion, going to the more high end leather-based (or so they claim) products. Of course, it is not all about dressing up the Samsung Galaxy S6, but also the Samsung Galaxy S6 Edge as well. As for the screen, you might want to check out a screen protector for your device, too.
Do you think that these Chinese manufacturers are way too ruthless when it comes to rolling out peripherals? Perhaps not, as they probably want to gain first mover advantage.