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Unless you own a new Mac laptop (with the magnetic power jack), you've most likely at some point had the unpleasant experience of tripping on your laptop power cord, and reefing it out of the jack. This quite often leads to a faulty power jack, that needs to be replaced. This is usually very expensive if handled by the manufacturer.
PowerJacksOnline.com is a web-based provider of Laptop DC Jacks. They offer power jacks for a wide range of laptop makes and models. The jacks themselves are very cheap if you have the technical skills to install it yourself. Otherwise it's still only $149 USD installed.