Historical clue formulations

• What "duty-free" means — 2025-01-06
• Benefit of some online purchases — 2020-07-12
• Levy-free — 2018-05-21
• Feature of grocery purchases, often — 2012-06-17
• Welcome words for a buyer — 2001-07-18
• Benefit of some mail-order shopping — 1996-01-27