Orlando is notoriously expensive at peak times even in economy. Your best bet is going indirect and maybe also getting a package with car hire.

Alternatively, I seriously recommend an ex-EU. I’ve done it before with children )including one who was only 11 months) although we did do the TATL in F and worked out around the same price as direct in Y.

I would also suggest you try this website which is featured exclusively to those who want to visit the house of the mouse (and it’s surrounding attractions.)

https://www.thedibb.co.uk/forums/forumdisplay.php?f=48