Here are a few of the New England based sites:
General New England:
https://www.facebook.com/groups/NHsales/
https://www.facebook.com/groups/NEOYS/
https://www.facebook.com/groups/364418907021356/
Rhode Island:
Fall River RI https://www.facebook.com/groups/414949921965372/
Kent County RI https://www.facebook.com/groups/kentcountyyardsale/
Providence RI https://www.facebook.com/groups/providenceriindooryardsale/
Massachusetts:
https://www.facebook.com/groups/525077990884078/
https://www.facebook.com/groups/488079204632543/
https://www.facebook.com/groups/684728868217442/
New Hampshire
https://www.facebook.com/groups/NHOnlineYardSale/
Vermont:
https://www.facebook.com/groups/386446478086932/
https://www.facebook.com/groups/VTyardsale/
https://www.facebook.com/groups/VTOnlineyardsale/
Maine:
https://www.facebook.com/AugustaOnlineYardsale
https://www.facebook.com/groups/maineyardsale/
https://www.facebook.com/groups/304529732968073/
https://www.facebook.com/groups/476282399076134/
Connecticut:
https://www.facebook.com/groups/194088927343890/
https://www.facebook.com/groups/206000129422209/
https://www.facebook.com/groups/175305839301627/
https://www.facebook.com/groups/348489075226022/
Most of these are closed groups that require request/approval to join. The criteria is usually that you live in the locality. The links above are the more state generic. As you browse these sites you will get a feel for which ones suit you best. If you search for specific cities and towns, many have their own even more local pages/groups.
After you have gotten rid of all your unwanted/unneeded gifts you may want to spend your new found cash or some of your gift cards on a New Years celebration in New England. Here are some unique options:
New Years Eve at the New England Aquarium offers dancing with the Penquins at a Black Tie Affair.
You must be over 21. For men a Jacket is required and for the ladies cocktail attire is expected.
http://www.eventbrite.com/e/new-years-eve-2014-at-the-new-england-aquarium-tickets-6345713199?aff=zvents
Another option that is more family friendly and less expensive but no less unique is to ring in the New year at the Annunciation Greek Orthodox Cathedral in Brookline Ma

Consider the 4th annual, wildly popular, New Years Eve in RI at the convention center in Providence which features a masquerade ball from 9 pm to 3 a.m. With food, drinks, music, dancing, prizes and optional extras. Get your tickets to the event and much more http://newyearseveri.com/
If you have more of a snowy venue in mind you might consider partying at Stratton in Vermont.
http://www.stratton.com/events-and-activities/events/2013/12/new-years-eve-celebration.aspx
This is of course a very family friendly set of events with kids crafts early in the day and a Torchlight Parade and Fireworks with a couple of special 21+ parties planned to start at 9pm for a fee.

Portland Maine is celebrating again this year.
https://www.facebook.com/NewYearsPortlandMaine
Several venues are offering parties. Check out the venues and the ticket prices.
http://www.newyearsportlandmaine.com/venues.html

Not to be outdone, Hartford CT's First night has over 40 events to explore. These city sponsored events offer the most for a varied age and interest group. The Bushnell Carousel will be open as well as the ice rink in the park to name a few. You want to check out the options and come prepared.
http://www.firstnighthartford.org/
Last but not least, it needs no introduction, is of course the 38th annual Boston's First night. So much to do and see and so little time. Here is a guide to help you decide when and where to start.
http://www.bostonmagazine.com/arts-entertainment/blog/2013/12/26/guide-first-night-events-2013-2014/
Who has not heard or seen on TV the great ice sculptures that can be found all across the city. Theater, dance, puppets, performers of every genre will be on display. Check out the FB page as well.
https://www.facebook.com/FirstNightBoston

Have fun, be responsible and safe into the New Year!