Sort list based on matching equal to another element

The list I have displays the LOCATION_NAME sorted by
LOCATION_NAME & START_TIME.

I need the COST to display in the next table cell, by
matching the SHIPMENT_GID from the REPORT_CUSTOMER
element to the REPORT_COST element.

This is what I have for the list of the SHIPMENT_GID
from the REPORT_CUSTOMER - which works great but I
can't figure out how to display the associated cost
for the matching SHIPMENT_GID.

<xsl:key name="records-by-party"
match="REPORT_CUSTOMER/ROW" use="LOCATION_NAME"/>

     <xsl:for-each select="REPORT_CUSTOMER/ROW[count(.
| key('records-by-party', LOCATION_NAME)[1]) = 1]">
       <hr/>
       <xsl:sort select="LOCATION_NAME" />
       <br />
       <xsl:for-each select="key('records-by-party',
LOCATION_NAME)">
       <xsl:sort select="START_TIME" />
       <xsl:value-of select="SHIPMENT_GID" /><br />
       </xsl:for-each>
       </xsl:for-each>

Sample XML:

<REPORT>
	<REPORT_COST>
 		<ROW>
 		<SHIPMENT_GID>123</SHIPMENT_GID>
		</ROW>
		<ROW>
 		<COST>100.00</COST>          <----  HOW DO I GET
THIS AMOUNT IN THE NEXT LIST?  
		</ROW>
	</REPORT_COST>
 	<REPORT_CUSTOMER>
 		<ROW>
 		<SHIPMENT_GID>123</SHIPMENT_GID>
		</ROW>
		<ROW>
 		<LOCATION_NAME>SAM'S PLACE</LOCATION_NAME>
		</ROW>
	</REPORT_CUSTOMER>
</REPORT>




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