To implement this on Ubercart 2 place this code at the end of your template.php file:
function phptemplate_uc_product_price($price, $context, $options = array()) {
if ($price == null || $price == 0 || $price=="0.00")
$output = '';
else {
$output = '<div class="product-info '. implode(' ', (array)$context['class']) .'">';
$output .= uc_price($price, $context, $options);
$output .= '</div>';
}
return $output;
}