If you have not had the chance to use Groupon they are really starting to put out some good deals. The way that it works is that they offer a great discounted deal, when enough people buy the deal it goes live and you get it at that price. It is collective buying power.
It is easy to do, go HERE and subscribe. At the top you can then pick cities to look for deals at. Remember that you can buy deals at other cities than where you live. Just make sure the offer will apply in your own city.