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Since you are looking to get the clasp of your MacBook Pro replaced, I would hazard a guess that you aren't talking about one of the recent unibody MacBook Pro models but are instead about the ones that were sold before this current generation. If that is the case then you should check to see if you still have Apple Care. Since it has been more than two years that the MacBook Pro line with the clasps was discontinued, it is highly unlikely that Apple will cover the broken clasp for you unless you already have the extended Apple Care Protection Plan on your Macbook in place. This may seem like a major problem but it is good news that clasps are cheap to replace. The left clasp of one of my friend's MacBook Pro came apart a year back and it only cost her $55 to get it replaced.
Unless you're tech savvy, good with hardware and have steady hands, I wouldn't recommend that you try doing something like that by yourself. Even if you are the tech world equivalent of MacGyver, there is the problem of procuring a clasp for your computer. I have tried eBay, Amazon and pretty much every other vendor that is known to supply the Mac community with various hardware parts and I am yet to find one selling the clasp. You could however have a look at this video here of a user showing you what you can do if your latch doesn't hold the screen when it is closed.