re: What do you do for 'extra' money?

I received an e-mail from an industry group that this company was looking for someone in my profession to do a focus group, so I called up, they asked me a few questions to make sure I was qualified, and the rest is history, I've been doing focus groups for them ever since.
Not sure where you live, but you may want to do a google search for companies that conduct focus groups in the city where you are at. Chances are if it's a big city, there is one or more.
Once you sign up they'll keep some general info about you and will call or e-mail you from time to time and check to see if you qualify for their upcoming opportunities.