Found it:
St. Louis To Orlando $147 RT Seniors $132 Thru Feb. 6, '02
United has reduced airfares between St. Louis and Orlando to $147 .......
It became available last Thursday (5/24).
I checked ual.com (United's website),
Unfortunately, this fare is not available anymore. You almost have to check this daily and then check the website of the corresponding airline to see if the fare is still available. Lots of these fares that they post in snooze you loose only last a few hours.
As St. Louis is served by Southwest airlines, keep checking, there will be more sales. But if you see one you like, don't delay...book it.
By the way, don't waste your money on a bestfares membership....there is another post about that previously and the verdict was they are a waste of money.