It has two parts to the latch. The one on the display, and the one on the bottom case. If I remember right you can't just buy the latch parts for either top or bottom, you have to replace the whole top or bottom. I'd say it would cost at least $200 or more for parts and labor. Sometimes the latch can be fixed but it does involve taking it apart so there would be bench time at least.

Do you want a carrying case or a case that covers the whole laptop. Kuzy, Speck, or Incase are pretty nice. There's a bunch out there. Search using MacBook Pro case.