Default Something to replace the back cover

I'm going to buy the G2, but I really don't like the back cover (or the back body? I don't know hot to call that) it seems too much made with a low quality plastic, do you know if somewhere there are a shop to buy a better back cover? I really need that

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LG G2 Black (32GB)
ROM: Stock LG Rom using Xposed Framework
Kernel: Stock


Google Nexus 7 (2013) Black (32GB) with LTE
ROM: Paranoid Android Latest Build
Kernel: Stock


Google Nexus 4 Black (16GB)
ROM: Paranoid Android Latest Build
Kernel: Stock
NOW JUST A SECONDARY PHONE


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