You've probably heard of Groupon-a mash-up of "group coupon"-which offers deep, daily, online discounts to subscribers for popular businesses, from spas to restaurants, in a particular locale. Since that business model took off in November 2008, a slew of copycat sites have popped up hoping to emulate Groupon's social networking finesse and swelling customer base. GreenDeals (greendeals.org), which launched last fall, is one of the latest shopping sites to follow in Groupon's footsteps, but with bargains centered on green goods and services.
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