Go to a pharmacy and buy a bottle of pharmaceutical grade boric acid. Put a couple teaspoons of the powder into a cup and add about a quarter of a cup of something sticky and sweet like corn or pancake syrup. Mix will. Lay down an unfolded sheet of newspaper on the ground where you have seen the most roaches and drizzle the goo all over it. Leave it over night or over a couple of nights. The buggers will come out in the dark and feed on that stuff like crazy. It'll kill all of them, but you won't see them as they don't die right away. Fold up the paper and toss it. Repeat at weekly intervals for a month or so to get all the newly hatched bugs. Easy, almost free, no residual poisons and as effective as any exterminator. They'll come back, but they'll come back no matter what you do as long as there's an attractively dark, damp environment for them. When they do, repeat the process.

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