Ask HN: Which sites can get their users to vote on a poll I create?

I would like to create a simple poll to know my potential customers' views of a service. I can't do it with SurveyMonkey because my selected sample (friends and family) will be bias. Which sites have a sizable voter/beta tester populations, who are willing to vote on my poll? (I am willing to pay a few hundred bucks for a hundred votes). Thanks for your help.