What's Your Favorite Discount Travel Website?

With the offensively high price of gas, and airlines beginning to charge for checked baggage, I'm almost in favor of a staycation this Summer. It's depressing really, because summertime is the best time to skip town and waste away again in Margaritaville.

If you're not going to take my prodding for a Smart Car, and you'll be flying the friendly skies, then I'm asking you as much for advice as curiosity; when you book airfare online, what's your favorite discount travel website?
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