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I don't think :apple: would sell them. It would make it way to easy for someone to build clones and sell them with the :apple: logo on it...
 
If you're still under warranty, contact Applecare. A representative got me in touch with a local authorized Apple service provider (i.e. Cornice). I received a great quote and was able to replace my bottom panel along with its lovely scratches and dents. 🙂
 
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