I heartily recommend trying Spirit Airlines, ATA, or Southwest (if any of them have services from your airports). Our tix from O'Hare to MCO were only $185 pp with Spirit, taxes and fees included.
Try several places to get the best rates. Expedia, Orbitz, and Travelocity were all giving out higher rates when we snagged our seats from CheapTickets.com. I don't know if it was the luck of the draw or a lag in the updating of the price database, but you can definitely get lucky sometimes if you shop around!
Best of luck!