Donut, congrats on your retirement! You live in a great place to enjoy it! I bet its awesome right now with all of the trees turning!
To add to logbutcher's tips...Keep an eye on this site:
http://boston.craigslist.org/
Pay close attention to the 'Free' section. You will frequently find home owners that take down a tree or 2 themselves and don't want the wood. Since craigslist is free to post to, its very easy for them to let people know they have something. Or, you'll find people that save money by just having a tree guy come in and drop them...then post free firewood for the taking (I've found this to be very common).
You can also post your own 'wanted' classified, but I'm not so sure people respond to those as much.
Craigslist is EXTREMELY popular down here in the Philly area, and looks like from the amount of postings it is as well in the Boston area. An interesting side note, ALL of the people that I have ever dealt with that post to and/or use craigslist to find items are very nice quality people.
A tip if I may...if you find someone that offers free wood on craigslist and its near where you live and you want the wood...move fast! They're are a lot of people watching the site. That's what's great about it though, the word of mouth keeps spreading and more and more people post stuff there!
Good luck!
DAN