I know a guy that uses a DocuPen.  You can find them on ebay, or buy them new for about $200.00.  I thought about getting one, but don't know how the quality is.  I would hate to get home and not have a good copy.  Some clerks won't let you use them, I have heard.  If they told me that, I think we would have a serious conversation about freedom.  Good Luck!