XPathOnURL Help

I want to use XPathOnURL to grab the first price for an ebay search. So if had a link: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&LH_ItemCondition=3&_nkw=Carhartt+Men's+Acrylic+Watch+Hat&_sop=15

What would the XPathOnURL be to grab the first price listed, if that's even possible?

XPathOnUrl("http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&LH_ItemCondition=3&_nkw=Carhartt+Men%27s+Acrylic+Watch+Hat&_sop=15";"(//li[contains(@class,'lvprice')]/span)[1]")