|  Respuesta: Gastos de envios gratis para mi ciudad y con coste para fuera de ella. TAr  
  Os pongo el código de Flat4.php
 <?php
 /*
 $Id: flat.php 1749 2007-12-20 00:52:16Z hpdl $
 
 osCommerce, Open Source E-Commerce Solutions
 http://www.oscommerce.com
 
 Copyright (c) 2004 osCommerce
 
 Released under the GNU General Public License
 */
 
 class flat4 {
 var $code, $title, $description, $icon, $enabled;
 
 // class constructor
 function flat4() {
 global $order;
 
 $this->code = 'flat4';
 $this->title = MODULE_SHIPPING_FLAT_TEXT_TITLE_4;
 $this->description = MODULE_SHIPPING_FLAT_TEXT_DESCRIPTION_4;
 $this->sort_order = MODULE_SHIPPING_FLAT_SORT_ORDER_4;
 $this->icon = '';
 $this->tax_class = MODULE_SHIPPING_FLAT_TAX_CLASS_4;
 $this->enabled = ((MODULE_SHIPPING_FLAT_STATUS_4 == 'True') ? true : false);
 
 if ( ($this->enabled == true) && ((int)MODULE_SHIPPING_FLAT_ZONE_4 > 0) ) {
 $check_flag = false;
 $check_query = tep_db_query("select zone_id from " . TABLE_ZONES_TO_GEO_ZONES . " where geo_zone_id = '" . MODULE_SHIPPING_FLAT_ZONE_4 . "' and zone_country_id = '" . $order->delivery['country']['id'] . "' order by zone_id");
 while ($check = tep_db_fetch_array($check_query)) {
 if ($check['zone_id'] < 1) {
 $check_flag = true;
 break;
 } elseif ($check['zone_id'] == $order->delivery['zone_id']) {
 $check_flag = true;
 break;
 }
 }
 
 if ($check_flag == false) {
 $this->enabled = false;
 }
 }
 }
 
 // class methods
 function quote($method = '') {
 global $order;
 
 $this->quotes = array('id' => $this->code,
 'module' => MODULE_SHIPPING_FLAT_TEXT_TITLE,
 'methods' => array(array('id' => $this->code,
 'title' => MODULE_SHIPPING_FLAT_TEXT_WAY,
 'cost' => MODULE_SHIPPING_FLAT_COST_4)));
 
 if ($this->tax_class > 0) {
 $this->quotes['tax'] = tep_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
 }
 
 if (tep_not_null($this->icon)) $this->quotes['icon'] = tep_image($this->icon, $this->title);
 
 return $this->quotes;
 }
 
 function check() {
 if (!isset($this->_check)) {
 $check_query = tep_db_query("select configuration_value from " . TABLE_CONFIGURATION . " where configuration_key = 'MODULE_SHIPPING_FLAT_STATUS_4'");
 $this->_check = tep_db_num_rows($check_query);
 }
 return $this->_check;
 }
 
 function install() {
 tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable Flat Shipping', 'MODULE_SHIPPING_FLAT_STATUS_4', 'True', 'Do you want to offer flat rate shipping?', '6', '0', 'tep_cfg_select_option(array(\'True\', \'False\'), ', now())");
 tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Shipping Cost', 'MODULE_SHIPPING_FLAT_COST_4', '5.00', 'The shipping cost for all orders using this shipping method.', '6', '0', now())");
 tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Tax Class', 'MODULE_SHIPPING_FLAT_TAX_CLASS_4', '0', 'Use the following tax class on the shipping fee.', '6', '0', 'tep_get_tax_class_title', 'tep_cfg_pull_down_tax_classes(', now())");
 tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Shipping Zone', 'MODULE_SHIPPING_FLAT_ZONE_4', '0', 'If a zone is selected, only enable this shipping method for that zone.', '6', '0', 'tep_get_zone_class_title', 'tep_cfg_pull_down_zone_classes(', now())");
 tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Sort Order', 'MODULE_SHIPPING_FLAT_SORT_ORDER_4', '0', 'Sort order of display.', '6', '0', now())");
 }
 
 function remove() {
 tep_db_query("delete from " . TABLE_CONFIGURATION . " where configuration_key in ('" . implode("', '", $this->keys()) . "')");
 }
 
 function keys() {
 return array('MODULE_SHIPPING_FLAT_STATUS_4', 'MODULE_SHIPPING_FLAT_COST_4', 'MODULE_SHIPPING_FLAT_TAX_CLASS_4', 'MODULE_SHIPPING_FLAT_ZONE_4', 'MODULE_SHIPPING_FLAT_SORT_ORDER_4');
 }
 }
 ?>
 
 
 
 
 La verdad es que no se donde está el problema.
 Los otros archivos flat.php son iguales pero retocados con flat1.php para una zona
 flat2.php para otra zona
 flat3.php para otra zona.
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