I believe Amdro Fire Ant Bait is the gold standard around here. Doesn't kill 'em by tomorrow but eventually poisons the whole colony.

http://www.amdro.com/Product-Chooser

Drought has done a number on 'em around here too, that and crazy ants.

Birdwatcher

"...if the gentlemen of Virginia shall send us a dozen of their sons, we would take great care in their education, instruct them in all we know, and make men of them." Canasatego 1744