SurveySavvy
SurveySavvy is a panel from Luth Research, another industry giant.
The best, and by far, the most talked about thing about SS is that they have some of the highest paying surveys.
Studies typically pay between $1 to $20, again, depending on length and topic of the survey. I have had a lot of $5 and $10 surveys with them. So this one is a must use site.
