I found this website
EasyTaxFix.com - its a DIY website to see if you can reduce your property taxes. I liked it because it told me if I had a chance of reducing my taxes before I paid for the report.
Only 2 comps came up for me, and I wanted to use the house next door which I know sold in December and is identical to mine. I called the Middlesex County Tax Assessor (spoke to the actual assessor) and he told me that the County will allow me to use comps a few months before or after their date range, but I should include a letter of explanation about the December sale with my appeal.
Whatever I get back, its still cheaper than hiring an attorney who is going to take a percentage of my refund.