We have configured a few stores here, which you can search live. You can also redirect the internal search of WP to this page and then automatically suggest products to the visitor.
[atkp_searchform template='searchtext' targetpage='54'][/atkp_searchform]
Search results at amazon.de
Search results at eBay
[atkp_livelist template='default_live' shop_ids='19,20' livetemplate='secondwide'][/atkp_livelist]