if zillow doesn't have it you can also try propertyshark.com (i believe its free for the first 15 properties)
http://www.norfolkdeeds.org. Open it in Internet explorer instead of Firefox or another browser. Also, you only need a paid account if you want to print the data. You will be able to not only find out what was paid for the house, but what mortgages have been filed for recording at the Registry. If you want to learn a whole lot about the financial situation of your neighbors, it is amazing what this site provides. If you want outside of Norfolk County go to http://www.masslandrecords.com.