One good site to visit is StubHub, where fans and season ticket holders sell their tickets. StubHub do however add on a fee of 10% of the ticket price. Another good site to try is the ubiquitous eBay which has large numbers of tickets for sale by auction. Yet a further possibility is to try out the online classifieds, and the classifieds of your local and national newspapers.

Another good bet is to try the various ticket brokers, such as www.ticketmaster.com, www.ticketsnow.com and www.bluefishtickets.com, which all tend to have a good selection of tickets for top events. Ticket brokers tend to be fairly professional, and though expensive, you can be sure that you are getting the genuine article. Their staff are fairly expert at ticketing, and helpful too.

Hope this helps.

-Michael