code: func (c *Redshift) DescribeReservedNodeOfferings(input *DescribeReservedNodeOfferingsInput) (*DescribeReservedNodeOfferingsOutput, error) {
  	req, out := c.DescribeReservedNodeOfferingsRequest(input)
  	return out, req.Send()
  }
docs: // DescribeReservedNodeOfferings API operation for Amazon Redshift.
  //
  // Returns a list of the available reserved node offerings by Amazon Redshift
  // with their descriptions including the node type, the fixed and recurring
  // costs of reserving the node and duration the node will be reserved for you.
  // These descriptions help you determine which reserve node offering you want
  // to purchase. You then use the unique offering ID in you call to PurchaseReservedNodeOffering
  // to reserve one or more nodes for your Amazon Redshift cluster.
  //
  // For more information about reserved node offerings, go to Purchasing Reserved
  // Nodes (https://docs.aws.amazon.com/redshift/latest/mgmt/purchase-reserved-node-instance.html)
  // in the Amazon Redshift Cluster Management Guide.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for Amazon Redshift's
  // API operation DescribeReservedNodeOfferings for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeReservedNodeOfferingNotFoundFault "ReservedNodeOfferingNotFound"
  //   Specified offering does not exist.
  //
  //   * ErrCodeUnsupportedOperationFault "UnsupportedOperation"
  //   The requested operation isn't supported.
  //
  //   * ErrCodeDependentServiceUnavailableFault "DependentServiceUnavailableFault"
  //   Your request cannot be completed because a dependent internal service is
  //   temporarily unavailable. Wait 30 to 60 seconds and try again.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DescribeReservedNodeOfferings