MacBookPro 17" bottom case: CAD$239 + $30 labour
I called the Apple Store to find out.
**WARNING: GRAPHIC DESCRIPTION BELOW**
My 2010 MacBookPro 17" was badly bent when my bag's strap broke and the whole thing went tumbling down 2 flights of stairs. It was in the bag but the bottom case was horribly dented in misaligning the case holes from the ports. If left as is, I couldn't plug ethernet or Firewire in. It was
that bad.
I was of course angry so my better judgement was absent. I was about to do something crazy. After babying my MacBookPro for all of its life, I put an eraser on the case, and banged it with a hammer!!

hahaha!! It worked. It's almost completely unnoticeable. This is a very malleable metal it seems.
Still, although it's not completely visible, I still know it's there and some other wear and tear have tainted the case in my eyes. I've been upgrading the internals for the past few months (8GB RAM 1TB HDD) so I'd like to start fresh with a new case. This Mac is going to last me at least another 2 years.