How expensive are these machines?

I never drink a full pot of coffee, and we rarely have people over and want to make a ton of coffee at once, so I was thinking it might be nice to get a single cup coffee maker. A friend of mine suggested the Keurig coffee makers, so I am trying to find out a bit more about them. How much are these single cup coffee machines? Do they really work well? I am assuming they must cost a decent amount, so I am trying to figure out whether it would be worth the extra money to buy one or if I should just stick to my coffee pot.

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