I need plastic cover for my Laptop

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I have an MSI GX700 (Megabook) laptop. A month ago it fell down and broke almost every plastic cover but still is functional. I was try to contact MSI to buy new cover but they was answer me that they don't shell them as parts but they replace them only if i send my laptop to their service. But a friend of me told me that their service will keep my Laptop 3-5 months and after that this repair will cost me almost like if I buy a second hand laptop the same made. Can someone give me any link were I can find spare parts for laptops especially plastic covers ?