AFAIK, the XXD series come with a screen protector fitted by the factory - you're not looking at the LCD screen itself when you use the camera - and it's quite cheap/easy to replace. Is this what you're looking for, and do you want an additional protector?
Not quite sure what you mean. How did the LCD screen get scuff marks on it? Were you using the camera without the protective cover - this is fitted during manufacture.
Your LCD screen is NOT scuffed.
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