As a few have mentioned, bargains for this year's summer holidays have been few and far between.
Back in 2010, we had Heathrow - Miami flights (booked the previous September) for £403 each through American Airlines.
In 2012, the Delta "glitch" gave us MAN-Paris-Orlando for £527 each.
This year, we decided to treat ourselves as it is DDs 16th and my 50th birthdays, so we splashed out on PE flights with VA from MAN to Orlando, booked via Netflights through Delta on a codeshare for £1,200. At the time we booked, economy flights were £1,100 so we bit the bullet and booked.
However, a few months ago, there were flights available through Irish travel agents which involved flying out to Dublin/Cork/Shannon first, then travelling back through Gatwick or Manchester and onto Orlando with VA. I saw prices of £600pp for PE quoted, although you had to add-on the cost of flights out to Ireland and an overnight stay.
If you are flexible with departure and arrival airports, it can work out cheaper than flying directly into Orlando. We live in Wigan so MAN is only 40 minutes away, but we are happy to fly from other airports if the price is right.
When searching for flights, also consider indirect flights which open up other airports such as Tampa, Jacksonville, Fort Lauderdale, Miami, Palm Beach. As an example, over the last few days, Netflights have been showing flights from MAN to Jacksonville departing 30th July returning 15th August (our dates) for £598 with one stop via Chicago on American Airlines.
The best advice is to keep checking the forums to see if people have found that elusive bargain.
HTH.