Bridgeport, Hartford, New Haven, Danbury, Stamford CT

Wallingford"
DeMarinto Fixtures (website)
Supermarket/Restraunt liquidator


Check ads for used gondola in Bridgeport, Hartford and New Haven.

Next, check into sales in nearby major cities, like Boston
There's a big enough retail envornment in every direction to hope for a going out of business sale. 

Going towards Canada in any direction will be hit or miss.  Maine is kind of a shipping dead end, and the Canadian border could add a new element of expense or tariff.

The best you can do is probably just keep looking along the coast and west for random dealers and potential closeouts.