The Elm Street Goodwill is the way to go. It's much bigger and nicer. The stuff is the same but it just has more selection because of more space. I still go to the Broad Street one sometimes but it's very tight and kinda dingy. I went to the Goodwill in Norwalk once and it's pretty good too but not as big as Elm Street.

There's one at St. John's church downtown but it's only open twice a week or so for a few hours and it's also just one small room the size of a bedroom so not a lot of stuff but they had some high quality clothes and jewelry and housewares.

There's a Salvation Army in Port Chester that's pretty big, probably similar size to the Elm Street Goodwill but spread over 3 floors. So a good amount of selection but pretty expensive.

Then there's the Rummage Room in Old Greenwhich but I haven't had a chance to check it out because of its limited hours.