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SeatGeek is the clear winner for best prices and selection versus StubHub, RazorGator, Fanxchange, TicketZoom, and even Ticketmaster.
SeatGeek is a ticket aggregator (think Orbitz for tickets) that shows you all of the tickets available from other smaller ticket resellers. SeatGeek tends to have the best prices and the best selection.
StubHub, owned by eBay, is a prominent peer-to-peer reseller, has a large ticket inventory, and tends to have good prices.
Ticketmaster is a trustworthy and reliable seller but the selection of tickets doesn't tend to be quite as good as some of the other ticket websites.
RazorGator is a ticket marketplace that lists all of its tickets on SeatGeek (at the same price) so there isn't an actual need to go to RazorGator.com directly.
Similar to RazorGator, Fanxchange is also listed on SeatGeek's marketplace so you don't need to shop directly on Fanxchange's website.
TicketZoom is a low traffic / volume marketplace compared to the other sites listed on this page so it's highly unlikely that you'll find a better deal on here than on SeatGeek, StubHub, or one of the other listed sites.
Your best bet for the lowest prices and largest selection of tickets is SeatGeek.