re you a sucker for tax-free girly drinks? Who isn’t, right? The new Seventh Avenue Mexican joint, Barrio, is offering patrons a 15% discount until April 30th so you better hurry while the blender’s hot. Order up prickly pear or tamarind margarita to pair with your tasty pork tenderloin or your black bean and sweet plantain empanadas. North Park Slope just got some flavor. –J.T.