Fieldwork Phoenix is a local market research company. They pay very well, if you qualify for a study and they're usually fairly simple. I highly recommend looking into it. I have done some super simple ones, years ago. If I remember right, they paid anywhere from $50 – $75 for an hour or two of your time.
You can fill out a general application at the link above, but if you have a child
36 (update: survey says 24 months instead) months or younger, fill out the pre-screening questions and they will contact you if you qualify. The email Jess received said, "We are looking for A LOT of Moms with children up to 36 months old for an upcoming study. This study will be held on May 15th, 16th or 17th."