K.T.
A few of my friends swear by the new plug ins that keep away mice and insects. I havent tried them myself yet but from my understanding they work wonders!!! They are available in Home Depot for like 20 bucks for two and they dont have to be replaced once you use them. This may be a safer option to having children who crawl around and may touch the sprays and boric acid around the house (although boric acid would be my next suggestion). Also chalk is an inexpensive solution for roaches because something in the chalk causes a reaction in their nervous system and paralyzes them. Best of luck to you!!!