Last year when the people I work for had fleas with their cats, I bought some flea meds for our three... other than that, we never use it. Never had a problem. Just got it in case I happened to bring them home.. yuck!

I got a box of BioSpot from Petsmart.. was ~$16 or so for 3 doses. It had the egg killer stuff in it.. drawing a blank on the name. Seemed to work.. no fleas ever showed up.