Right now, I'm just waiting for an interview 😉
I should only need to fly to one of my interviews (USC) if I get one at every school I applied to, and thanks to Southwest's Rapid Rewards, I have a free ticket waiting for me. Hopefully that comes in handy...
Anyway, I suggest trying out the regular sites like Expedia and Travelocity. Priceline can be okay, especially if you leave a day early. You can also use Qixo and Mobissimo to search several sites at once. StudentUniverse has a good reputation, but I've never used them. If you even plan on trying them out, register now so they can confirm that you're a student before you have to rush to get a ticket. Don't forget to check Southwest's website if your destination is serviced by them, too, as their fares are only found on their website.