Hi Funshine,
We are going back to Florida at Easter this year and most companies don't let you book more than 11 months ahead. The flights get booked up really quickly for this period so it is very important to book as early as possible. There are very few last minute deals for Easter and we found that by booking flights at the first opportunity we saved hundreds of pounds! We have been to Florida twice at Easter and it's quite an expensive time to go and the parks are well busy. If you can go a little later or earlier it may be less stressful and cheaper. Flight prices vary considerably and travel agents can offer as good a deal as the internet. We booked through Kenwood Travel 020 7749 9220 and they have been very good.(if you are in UK). Paid £400 deposit and balance due 8 weeks prior to deperture.