Cheap online airfare?

I'm trying to fly my best friend into town for my wedding (she's my maid of honor) and she can't afford the ticket, so I have to pay. She wouldn't be leaving until July 26th (flexible) and coming back July 30th (flexible). The cheapest I've found is $372. I've tried orbitz, expedia, kayak, cheaptickets, cheapoair, etc etc... Please help! I don't exactly have a lot of money because I'm paying for a lot of my wedding...it's so stressful! Also, she's a college student, so I think she can get discounts on some stuff. Any info is VERY VERY appreciated!