If you go to http://www.northbostonrealestate.com, at the bottom of the home page is an Economic & Market Watch Report for 3rd qtr 2009. Go to Essex County and zip code 01915 for Beverly information for this quarter. If this information is helpful, I can email you quarterly reports back as far as 2003. I hope this will be helpful.
If you want to let me know what time span you're interested in, I can put together the info for Beverly. I.e. # active, uag, sold Jan 1, 2008-Dec. 31, 2008, etc. You'd have to share your email with me. Up to you, but happy to do it. Tina@YourNorthShoreHome.com.
This link will help you with your research http://www.marealtor.com/content/housing_data.htm Feel free to contact me if I can be of any further help. I grew up in Beverly and and stil reside there.