Boric Acid is the best. It's totally safe. Don't let the "Acid" part scare you. They sell it at Home Depot. Here's a link http://www.homedepot.com/webapp/wcs ... p;storeId=10051&catalogId=10053#
Along with everything else written here get rid of all stored paper products. Roaches lay millions of eggs. They are attracted to paper, cloth, adhesives on labels on cans etc. You don't say if you live in a crowded neighborhood or not. If you do be certain that they are not coming to your home from your neighbors.
To fully understand how to get rid of roaches, begin with this helpful advice. The second link tells you what you can do to prevent their returning.
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