I couldn't find an option or a plugin that work reference a "printable page" CSS file, so I did this hack... and it worked! :-)
Admin Panel -> Settings -> Main Settings -> Global Page Settings -> Custom Head Code:
<div style="position:absolute;top:0px;left:0px;z-index:100;">
<input type="button" value="Printable" onclick="
$('.ow_sidebar').css('visibility', 'hidden');
$('.ow_sidebar').css('display', 'none');
$('.ow_sidebar').css('position', 'absolute');
$('.ow_header_pic').css('visibility', 'hidden');
$('.ow_header_pic').css('display', 'none');
$('.ow_header_pic').css('position', 'absolute');
$('.ow_chat').css('display','none');
$('.ow_highbox').css('display','none');
$('.ow_highbox').css('visibility', 'hidden');
$('.ow_header').css('display','none');
$('.ow_header').css('visibility', 'hidden');
$('.ow_menu_wrap').css('display','none');
$('.ow_menu_wrap').css('visibility', 'hidden');
$('.ow_site_panel').css('display','none');
$('.ow_site_panel').css('visibility', 'hidden');
$('.ow_page_wrap').css('background-image','none');
">
</div>