You can find cheap discount tickets at Hotwire. In my experience, they are not undersold by many, if any, other well-known sites. You can also book a hotel or rental car through them, and get a discount on that as well.
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There are a lot of websites where you can buy cheap tickets. This sites don´t "sell" them, they are only places where the ticket holder can offer his/her tickets, most of them are Season card holders. So if they don't want to go to a match they sell their ticket, but you won´t find a person who will sell their tickets for the big games, if they will do it, the tickets won't be cheap anymore.
Please be advised that in many countries issue of ticket fraud are rising and genuine "fan" are the target audience for this type of criminal activity
Some websites that offer cheap tickets for sale include Kayak, Travel Zoo, Expedia and Fare Compare. Another website you may be interested in is Travelocity.