Related Clues:

• Thanks to its being such a good buy, by the sound of it
• That sounds like a good buy, deserving gratitude at the double
• "See ya, Sophia"
• "Ta-ta" in Turin
• Farewell, in 55 Down
• "Later, dahling!"
• Venetian valediction
• Conversation stopper
• Doubly thankful to hear this as one leaves?
• Exit line
• So long, in Siena
• Goodbye, in Italy
• So long, in 43-Across
• 'See ya,' in Sorrento
• "Farewell, cara mia"