Price is 0 then show "On Request" text
Add this to your (template) .tpl.php file

&lt;?php

if ($node = menu_get_object()) {
  // Get the nid
  $nid = $node-&gt;nid;

$node = node_load($nid);
$wrapper = entity_metadata_wrapper('node', $node);
$field_value = $wrapper-&gt;field_price-&gt;value();

if ($field_value == 0) {
  print 'On Request'; 
  } else { 
  print $field_value;
  }
}

?&gt;


Not sure if the machine name of price is field_price. 

If the machine name is just price then use $field_value = $wrapper-&gt;price-&gt;value(); instead.