Take a look at surveymonkey.com. Create an account, it’s free so far, then:

a. Choose “create a survey start from template.”
b. The select “market research – product testing” and do what is required to use their template.
c. Move ahead and choose “collect responses.’
d. Move ahead and choose “buy targeted responses.’ It’s OK because you don’t have to pay anything yet or ever.
e. Review the various options they provide. You will see a cost per interview figure at the end.