目前观察来看全是VC的listing有这个推广，而且效果很不错，销量有涨不少。
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找到亚马逊的条款了。只有亚马逊自营有这个，持续到6月30号。淦啊！

Promotion Terms
- To claim the discount, add the item to your cart and mark it as a gift. Add gift wrap to the order during checkout. Add code GIFTWRAP50 for 50% off the price of the gift wrap service.
- This is a limited time offer.
- Offer only applies to products sold by Amazon.com or Amazon.com Services LLC (look for "sold by Amazon.com" or "sold by Amazon.com Services LLC " on the product detail page). Products sold by third-party sellers or other Amazon entities will not qualify for this offer, even if "fulfilled by Amazon.com" or "Prime Eligible".
- Offer does not apply to digital content.
- Offer good while supplies last.
- Shipping charges and taxes may apply to the full value of discounted and free promotional items.
- Items must be purchased in a single order and shipped at the same speed to a single address.
- Offer limited to one per customer and account.
- Promotional code expires at 11:59 p.m. (PT) June 30, 2022.
- Promotional code only applies to a single purchase of Amazon’s gift wrap service in Checkout.
- Amazon reserves the right to modify or cancel the offer at any time.
- Offer is non-transferable and may not be resold.
- Offer discount will be allocated proportionally among all promotional items in your order.
- If any of the products or content related to this offer are returned, your refund will equal the amount you paid for the product or content, subject to applicable refund policies.
- If you violate any of these terms, the offer will be invalid.
- Unless an Amazon Gift Card is the stated benefit of the promotion, promotional codes (including those placed directly in accounts) may not be redeemed for Amazon Gift Cards.