Daily deal sites: Beware these five things

Daily deal sites offer substantial discounts on everything from restaurant meals and kids' clothes to car detailing and getaways – if you're careful and read the fine print.

3. Availability can be limited

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    Chef Paul Kendall, right, demonstrates cooking techniques while Pegg, left, and Dick Bisher look on during a cooking class at a Learning Kitchen in West Chester, Ohio. The Learning Kitchen has used Groupon and Foursquare for mobile marketing.
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Let's say a small auto-detailing business in your area offers an 80 percent discount on its service. If the coupon is well received, the shop may get so much response that it can't schedule all the appointments in the necessary time frame. If that's the case, you may be out of luck – unless the vendor extends the window of opportunity. If you find a deal that's particularly attractive or popular, contact the business first for appointment options.

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