There is an assortment of powders that you can use, Diazinon being one of them that you sprinkle outside the house before they get in, and it kills them. Raid also has a spray that you can use inside that you put on their trails and it kills them also when they track though it and take it back and share it with the "Homies".
I had some "Clear Sugar syrup stuff" that I got at an old hardware store that was probably illegal for about forty years with Cyanide in it, but they had it on the shelf for at least that long. I bought it and put about a drop on a piece of cardboard and repeated that all over the house and outside. They are suppose to eat it and go back to the "Farm" and share it. Needless to say the next morning when I went downstairs, it looked like the kids had spilled raisins all over the floor... It was about a thousand dead ants....
Pretty much killed that problem and I used the Diazinon outside from then on with no problems, but you may not be able to get it any more...
http://entweb.clemson.edu/pesticid/issues/diazinon.htm