Recommendations of Focus Group/Studies websites?

I've been interested in participating in more studies and focus groups, similar to what Respondent and UserInterviews do. Im wondering if you have more suggestions, websites where I can join to their data base and receive emails and invitations to participate in well paid studies.

Thank you!

submitted by /u/shigakure
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source https://www.reddit.com/r/beermoney/comments/pdht0j/recommendations_of_focus_groupstudies_websites/