This region includes: CT, MA, ME, NH, RI, VT

Retailers:

Ben Franklin Variety
Locations: MA, NH, RI, VT
Phone: 800-992-9307
Ben Franklin Crafts stores won't stock any Lego sets, but the Ben Franklin Variety stores carry some. It has been reported that some stores have had discontinued sets since the stock moves slowly. However, the selection is lacking in most locations.
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FAO Schwarz
Locations: CT, MA
Although FAO Schwarz is looked on as a nice toy store, their prices are insanely high. Some stores might have a large Lego display. Since you'd have to be insane to buy any Lego sets here, the displays would be the only reason to visit one.
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K-Mart
Locations: CT, MA, ME, NH, RI, VT
Phone: 800-355-6388
Who doesn't know what K-Mart is? You'll probably find that the selection between stores can vary greatly and the toy asiles are usually scattered across the floor. If there's a Toys R Us nearby, you'll probably find some discontinued sets, otherwise the stock will get rotated rather quickly. The prices are usually average and 20% off sales happen periodically. K-Mart does carry large-size Lego sets, unlike some other department stores.
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Learning Express
Locations: CT, MA, NH, VT
Phone: 978-889-1000
There aren't many of these stores around, but if you come across one, it might be worth stopping in. The prices are higher than usual, as with other educational-type stores, but some of these have been known to have a few discontinued sets in stock.
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Shelburne Toy & Hobby
Locations: Shelburne, VT
Phone: 802-985-8592
Before the Toys R Us opened in South Burlington, this was the largest Lego retailer in Vermont. The owner claims to move more Lego than Toys R Us. There is a fairly good selection, but it's at full retail. He has stuff Toys R Us doesn't and vice-versa.

Spag's
Locations: Shrewsbury and Springfield, MA
Spag's is a near-legendary general store type of retailer. They carry just about everything under the sun...including Lego. Their prices are usually lower than the average retail price and there is plenty of selection to choose from.
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The Construction Site
Locations: Waltham, MA
Phone: 781-899-7900
The Constrution Site is a small toy store which specializes in construction toys such as K'Nex, Erector, Capsela, and Lego. At least a quarter of the store is dedicated to Lego. Fully stocked shelves reach up to the ceiling. Not only do they stock every current Lego item, but you'll also find a wide selection of Dacta sets. While you're there, be sure to check out the constantly changing toy displays. The Construction Site is located at 284 Moody St. in Waltham, MA - across the street from Jordan's Furniture.
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The Toy Shop of Concord
Locations: Concord, MA
Phone: 508-369-2553
This isn't a chain...in fact, there's only one store. There is usually a good selection of current sets and the store has been known to recieve new sets before some of the larger stores. The owner of this small toy shop in Concord, MA takes phone orders and will ship across the country if he has what you're looking for.

Toyland
Locations: Yarmouth, ME
Other than Kay Bee, there aren't many toy-only stores in Maine. Toyland is one of them. Toyland is not part of a chain, but it has been known to recieve sets before other regional stores. Do not confuse this "Toyland" with the one in southern New Hampshire...which is nothing special. The store setups are similar, but it is unclear if they are related.