Membership surveys are always more expensive that you think they should be, however, I know Chamberlain Research does a good job. I have actually been part of a focus group that they did for the banking industry. I know Sharon Chamberlain and their work is very good. The phone number is: (608) 246-3010
Good luck and I hope your survey gives you a great deal of usable data!
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Amy Bliss CAE
Executive Director
Tomorrow's Home Foundation
Madison WI
(608) 255-3131
amy@housingalliance.us -------------------------------------------