Using the dates of the OP...
AirTran RT MCO-HPN (non-stop) for $150
AirTran RT MCO-LGA (non-stop) for $219
Northwest (aka Delta) RT TPA-LGA (non-stop) for $239
Northwest (aka Delta) RT TPA-LGA (via DTW) for $296
Delta RT MCO-EWR (via CVG) for $302
Delta RT MCO-EWR (via ATL) for $304
American RT MCO-JFK (non-stop) for $364
Continental RT MCO-EWR (non-stop) for $399
www.kayak.com used for research.