Customer/user interviews are great ways to make extra money. User Interviews and Respondent.io are good paces to start. Here’s a list of online focus groups worth looking at:
Rare Patient Voice
FocusGroup.com *
PingPong *
Fieldwork.com
ExperienceDynamics.com
FindFocusGroups.com
Mindswarms.com
SurveyFeeds.com
FieldVoices.com
SISInternational.com
Survey Squad @
PlazaResearch.com
ProbeMarket.com
RecruitandField.com
dscout.com
FocusGroups.org
FocusInsite.com
GLGInsights.com