RetailMeNot, Coupon Codes for Everyone.

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Last night, I was looking for coupon codes to save money on my weekend rental car from Hertz when I ran across this amazing site. You can even download a Firefox plugin so it lets you know what sites RMN.com has codes for.

This is the Web 2.0 equivalent to your mom sitting at the kitchen table cutting out coupons from the Atlanta Journal-Constitution.