Looking for a Loon 138T or similar. Anyone know of any used ones or deals in the New england area?

You may want to check with some Old Town Canoe dealers. Their web site has a search capability for your area. I saw several used Loons (can't remember the models) earlier this year at Fernald Marine in Newbury, MA.

For other options, check this for a list of links to used yaks.

http://www.kayakonline.com/used_kayaks.html

I'm looking too and have found the most listing posted on the link to paddling.net.