Announcement reposted from Amazon Japan:
We are offering a discount promotion on Amazon Partnered Carrier service (Yamato) from September 24 through November 29, 2024. You will be eligible for discounted shipping rates during this period if you send your shipments to domestic Amazon fulfillment centers through the Amazon Partnered Carrier service (Yamato).
The Amazon Partnered Carrier service is a service that allows sellers to send shipments to Amazon at Amazon negotiated rates. The upcoming promotion will provide an additional discount against the standard negotiated rates.
For more details on this promotion, see FBA Partner Carrier Prgram promotion.