Urgent

If anybody knows where to get cheap last minute airfare, please let me know.
I am trying to get three people from DC to Jacksonville tomorrow and return on Sunday. It is really important. All I have seen is about 450 dollars or more.
The only other option we have is to drive 12 hours or my husband just goes by himself.

UPDATE: Well, we found one ticket for a fairly good price.
You just have to love UA Airways. This is the second time they helped us above and beyond when we had an emergency.