Three ideas: 1) Post it to LinkedIn -- you will probably get more than 500 responses. 2) Work with your local Small Business Development Center (SBDC) -- In a "fish with there the fish are" sort of approach, you can expect SBDCs to have connections with many small business owners and entrepreneurs -- they offer free advisory services to such individuals and can put you in contact with them for your survey. 3) Check out www.1MillionCups.com. This is a weekly program held in more than 50 cities across the country -- each week, in each city, two entrepreneurs present their company (usually startups and young firms) overview in 6 minutes or less, followed by about 20 minutes of Q&A from the audience. This is another place to connect with a lot of entrepreneurs very quickly. Good luck!