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Today's the big slurpee giveaway at 7-Elevens nationwide, where in celebration of the quickie mart's 81st birthday, customers can drop in to pick up gratis frozen beverages in special 7.11-ounce cups. Since there are only a four locations in NYC (with one more on the way), you have to plan your trip carefully. So we've created a handy-dandy map telling you exactly where you should go to procure your tasty treat—and the one store to avoid.