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When Al’s Shoe Store in East Boston is finally shuttered Sunday due to lack of business, it won’t be the end of an era, exactly, but pretty close. Established in 1924, Al’s is one of the last family-owned, full-service shoes stores in the Boston area, known in the trade as “Sit-and-Fit” stores. The Wein family that owned it for 90 years can’t keep it going on a shoestring anymore.