module.php

<?php
function static_json_menu() {
//  $items['view/path/that/returns/the/json'] = array(
  $items['store-locator/json'] = array(
    'title' => t('JSON Callback'),
    'page callback' => 'mymod_callback',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  return $items;
}

function static_json_callback() {
//  $json = "/some/file/on/disk.js";
  $json = "sites/default/files/google_store_locator/json";
  die(file_get_contents($json));
}