Modified example Gist for Alfred 2 to use Amazon Suggest for Amazon.de (instead of the default Amazon.com). Note: Remove `<?php .. ?>`, which I only added for syntax highlighting purposes.

amazon-suggest-germany.php

<?php
require('workflows.php');
$w = new Workflows();

// Grab input and build query url string
$in = "{query}";
$url = "http://completion.amazon.co.uk/search/complete?method=completion&q=".urlencode( $in )."&search-alias=aps&mkt=4&x=updateISSCompletion&noCacheIE=1295031912518";

// Grab the data from Amazon
$str = $w->request( $url );

// Strip off the "header" data
$str = substr( $str, strlen( 'completion = ["'.$in.'",[' ) );

// Remove the node info
$str = substr( $str, 0, strpos( $str, ']' ) );

//  Check to see if results were found
if ( $str == "" ):
  $w->result( time(), $in, 'No Suggestions', 'No search suggestions found. Search Amazon for '.$in, 'icon.png', 'yes' );
else:
	// Remove the double quotes around all the strings,
	$str = str_replace( '"', '', $str );

	// Split into an array using a comma as the delimiter
	$options = explode( ',', $str );

	// Loop through each result and make a feedback item
	foreach( $options as $option ):
		$w->result( time(), $option, $option, 'Find '.$option.' on Amazon', 'icon.png', 'yes', $option );
	endforeach;
endif;

// Return the result xml
echo $w->toxml();
?>

Main difference from stock PHP code:

• Changed to use completion.amazon.co.uk instead of completion.amazon.com
• Changed from mkt=1 to mkt=4 in the query string

Any more document about completion search ? I'd like to know how to search Italia&UK's data.Thanks!

@scoop What does changing from mkt=1 to mkt=4 do?

I still had to change the result action in the Alfred workflow from 'Default Web Search' to 'OpenURL' using the search URL of the German store (otherwise it will open a suggestion in the .com store).