Long time reader, first time poster...
I fly Spirit back and forth from FLL to MCO. I can normally get a roundtrip ticket for $55-$75. I'm going to stop at the airport today and see how much cheaper it can get. According to their site they are only charging me $0.02 for the flight and the rest are "taxes and fees" $33 is the "passenger usage fee"
I'll repost later today to let you know how it works out for me. If it really saves a lot this will be a lifesaver for me!