I am not a huge Groupon fan. See here. On the other hand some dentists have done well with Groupon. ATT is planning a similar service that might work for you.
Add another big player to the list of Groupon competitors: AT&T.
The telecom giant Monday began pre-registration to consumers in Los Angeles, Atlanta and Dallas-Fort Worth for a service via the company’s yp.com that will send daily deals to consumers.