http://www.bostonaquariumsociety.org/index.php?option=com_content&view=article&id=47&Itemid=53
" Meetings are free and open to everyone. They are held on the 3rd Monday of every month at The New England Aquarium's Harborside Learning Lab on Central Wharf in Boston, MA. The doors open at 7:30 pm. All meetings start at 8 pm with the speaker, followed by our monthly auction of fish and related products." -BAS website
Unfortunately, the monthly Boston meeting for November is tonight. Definitely try a meeting next month, it's free. The NNJ society auction charges $5 for a paddle, and I believe around $25 for a annual membership, which allows you to sell as well as other perks.