"I shop everywhere, but I buy on 14th Street" is an old New York saying. There used to be many inexpensive stores on 14th Street (especially around Union Square), so New Yorkers could get the best deals there.

Now, New Yorkers shop on 14th Street to go to places such as the Virgin Megastore and Whole Foods.

http://www.totallycool.net/02GoodCents.html
Also that old New York saying "I shop everywhere...but I buy on 14th street" can not be more true.

http://www.newsday.com/news/printedition/newyork/nyc-nystyl303947801aug30,0,7826572.story?coll=nyc-nynews-print
"My wardrobe styling is like my sex life - I shop everywhere, but I buy on 14th Street," announced Harmonie Moore, 40, of Astoria, in a tulle-topped pillbox hat and Barbara Bush-worthy pearls.

http://www.culturebot.org/archives/2004/02/20/TalkingWithColleenWerthmannPart1.php
Even if they were donated, that gives you a sense of TWG's access to wealth, prestige, and glamour, whereas we shop everywhere, but we buy on 14th Street. Not at Diesel, either. We're talking Odd Job Lot, Dee and Dee.

http://www.datalounge.com/cgi-bin/iowa/forum/thread/gossip/1948595/page-2.html
That you shop uptown, but you buy on 14th Street.

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