Diatomaceous Earth : http://en.wikipedia.org/wiki/Diatomaceous_earth
I have used it for years without any problems and no bugs in the house. It was recommended to me for termites and to keep the house clear of any roaches bugs etc.. by my real estate house inspector.
I poured it all around the house edge, placed it in styrofoam cups in the kitchen cabinets, pantry, in garage, all around my porch and have no problems with bugs...when I placed it around the doors... the bugs that roll up into balls just came out like armies marching and they were gone... never to return.
Hope this helps and it can be bought at Lowes or a flower/nursery. WalMart sells it in big big bags for use in swimming pools...so get it at Lowes. Call them and ask if they have it before you drive over.
Elly