On March 5th, Amazon issued an announcement about "cooperating carrier plan will provide 80% shipping discount", the original text is as follows:
Starting from April 1st, you can enjoy an 80%* discount on the standard fees of Amazon-partnered carriers for a limited time. This promotion is applicable to domestic shipments in the UK, France, Italy, Germany and Spain.
By joining the Amazon Cooperative Carrier Program, FBA sellers can enjoy shipping discounts when sending shipments to European fulfillment centers.
All domestic shipments created between April 1, 2021 and September 30, 2021 and sent to Amazon fulfillment centers using Amazon cooperative carriers will automatically apply the promotional discount.
The following conditions will apply:
This promotional offer is only applicable to sellers who have not used an Amazon partner carrier between January 1, 2021 and February 28, 2021.
The fulfillment center to which the shipment is sent and the shipping address must be in the same country/region.
The creation date of the shipment in Seller Central must be between April 1, 2021 and September 30, 2021.
The shipment must use an Amazon cooperative carrier.
* The discount is calculated based on the standard rates of the Amazon Cooperative Carrier Program at the time the shipment was created. Your final cost may vary, depending on the number, size, weight, and applicable rates of the boxes. The rates may change.