I posted a responce to a similar question a little while ago, and my advice still serves.
Check every site, contact, web address hourly. every day.
Wendy has booked 6 trips to corfu for us, all times of season, all day flights, variouse numbers in our party, and variouse durations.
The most expencive has been. £180 including meals and taxes.
The cheapest £128 etc, etc.
But she has spent a lot of time on the net and the telephone.
Prices change hourly dependant on demand.
Even enqiries on the net, without a booking, to a particular site will change the price. Go on try it, hit a particular site repeatedly, and in the morning the price will have increased.