Ever since we disturbed the hangout of the ants in our yard by putting in a screened-in porch, we have had ants show up in our kitchen (closest to the spot they were in our yard) from time to time. We have tried all kinds of things, but mostly lots of exterminator visits.
However, the last time they arrived, I battled them with a much cheaper method. And, funnily enough, they were gone in just about the same amount of time as when we had exterminators come. Go figure!