送料

1. Origins, structure, and basic meaning

• Structure: 送料 (そうりょう) is the charge for sending goods. In 送料が無料になる its status changes; in 送料を合わせて支払う it forms part of the payment.
• Basic usage: The fee may become free under an order-size condition, or it may be combined with the product price and paid.

2. Common pitfalls and similar expressions

• Shipping waived and shipping added to payment
  • The source uses independent noun 送料 with が or を, not the compound 送料無料. It should also remain distinct from the product price 代金.