Even without going into their authenticity, the prices they display with the search does not include taxes. If you go to checkout, they add a lot more money in taxes than the usual tax amount. A ticket I checked showed $285 on the main search page. When I went to checkout, it added taxes and showed a total of $400. That is not cheap definitely, as I could find cheaper prices on priceline and Kayak (TIS, check out kayak.com).