Shopping.com Shares Up 52 Pct in Debut  NEW YORK (Reuters) - Shares of Shopping.com &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SHOP.O target=/stocks/quickinfo/fullquote"&gt;SHOP.O&lt;/A&gt; jumped  as much as 52 percent in their market debut on Tuesday after  the company's initial public offering priced at the top of its  expected range.