Building a House With  EBay, Piece by Piece A growing number of people are turning to the online auction site not for knickknacks and trinkets, but for serious hardware and building materials.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;- The Washington Post&lt;/b&gt;&lt;/font&gt;