Have you checked American from Lambert? I was able to get roundtrip flights to/from MCO for $187 per person a few weeks ago (depart early am, come home late pm). We decided not to go with Allegiant for several reasons - it flies into Sanford, you have to pay to reserve a specific seat ahead of time ($11 per person), you pay for drinks on the flight, the days we want to fly on only have evening flight times, you pay to check luggage ($4 per bag) and the flight was priced at $302 w/o any of these extras. The only 2 conveniences that Mid-America airport offered for us was that the airport is closer than Lambert and less crowded.