Found this morning on Lastminute.com some flights from Glasgow to MCO in April & May flying with Aer Lingus at £459.79, while booking direct with Aer Lingus cost £590.
Example from Lastminute.com
Aer Lingus EI3221 / EI121
Depart: Sat 11 May 2013 08:20 Glasgow International Airport (GLA)
Arrive: Sat 11 May 2013 16:50 Orlando International Airport (MCO)
Aer Lingus EI120 / EI3222
Depart: Sat 25 May 2013 19:00 Orlando International Airport (MCO)
Arrive: Sun 26 May 2013 11:05 Glasgow International Airport (GLA)
Average flight price per person (includes £212.29 taxes and fees) £459.79.
http://www.kayak.co.uk/#/flights/GLA-MCO/2013-05-11/2013-05-25
http://www.kayak.co.uk/#/flights/GLA-MCO/2013-04-13/2013-04-27
Example from Lastminute.com
Aer Lingus EI3221 / EI121
Depart: Sat 11 May 2013 08:20 Glasgow International Airport (GLA)
Arrive: Sat 11 May 2013 16:50 Orlando International Airport (MCO)
Aer Lingus EI120 / EI3222
Depart: Sat 25 May 2013 19:00 Orlando International Airport (MCO)
Arrive: Sun 26 May 2013 11:05 Glasgow International Airport (GLA)
Average flight price per person (includes £212.29 taxes and fees) £459.79.
http://www.kayak.co.uk/#/flights/GLA-MCO/2013-05-11/2013-05-25
http://www.kayak.co.uk/#/flights/GLA-MCO/2013-04-13/2013-04-27