For all you designers out there - do you use Getty Images? If so, check
out their
recent blog post. They are asking for customer feedback/research on their blog. In short, fill out a form and wait to be contacted. If you're selected you will receive a gift certificate - usually from Amazon.com or Giftcertificates.com.
From the Getty blog:
"We’ll get in touch when we’re running research with people who match your profile.
What about the money? Participants we schedule can expect a generous gift certificate in return for their time."
According to Getty, after filling out the form you get
added to their customer research database. If your profile matches who they want to speak to for their current usability study, you'll get a
call. Each usability study consists of around 12-20 people and each
gets a gift certificate for participating.