 
						
										
				 
						
										
				 
						
										
				Airport duty-free shops go all out to entice you to buy booze, cigarettes, perfume, and chocolate. But on a low-tax island like Gran Canaria, is it worth waiting until the departure lounge to buy?
 
    
			 
    
			 
    
			 
    
			 
    
			 
    
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