there are all sorts of cool pyrethrums out there at most grow shops. ones liike "1600 X-clude" and "Preclude", both from Whitmire, are about as safe as any bug toxin can be and not kill you too. most of their stuff is approved for use in food prep areas after cleaning. used x-clude for years... kills spider mites deader than nixon.
careful though - the whitmire stuff comes in basically 2 types -- a total release fogger which you set off and stay out of the room for like 8 hrs, or a time release "spray as you go" kinda can. just watch which one you are getting. i have been known to mess up and get the wrong one.
i always rinse the plants well a few days later and pay attention to keeping the humidity low... that helps discourage the evil nazi-based vermin scum from returning too quickly...