I did several focus groups for Schlessinger in Dallas.
It is NOT much $$ when you think about drive time and your time.... TIME-$$ so I ONLY did the ones that paid $200 cash + and were 3 hrs or less.
When I do it, I plan it around lunchtime so I go to the focus group then go have lunch and shop.
When daughter was little I did one where they supplied diapers for a while and then one where formula was supplied plus the cash. I've done them on razors and deoderant as well..test the product and get paid and for radio stations.
Some companies are picky and will only choose people who have done less than 1 group a year. Hold out for the good ones!!