Oy.
I think Travelocity and Orbitz are about the same. They're both less expensive than Expedia.
Things will get cheaper as July 21 draws nearer, but then it will reach the point where the fare will rise about $50 to $100/day.
Go to
www.smarterliving.com. They find the lowest fares out of ALL the travel websites there are out there, which saves you a lot of time.
Good luck!