Related Clues:

• Supermarket rollers
• E-tail icons
• Supermarket sights
• Checkout facilitator
• Stores expect customers to return them
• Register reading
• Vehicles for luggage
• Market aids
• Parking lot hazards
• Stock control pattern
• They're pushed in a supermarket
• Lines in stores
• Grocery conveniences
• 'Howl!' — poem recited as a series of lines
• Nested supermarket array