title: Could not connect to the endpoint URL in Cost Explorer
body: <p>Im trying to use CostExplorer to estimate charges, filtered by TagName.</p>
  
  <pre><code>time_period = {'Start':'2017-12-18', 'End':'2017-12-19'}
  filters = {
    "And":
      [{
        "Tags": {
          "Key": "TagName",
          "Values": ["Test1"]
        }
      }]
  }
  
  print aws.get_cost_and_usage(TimePeriod=time_period, Granularity='DAILY', Metrics=['BlendedCost'], Filter=filters)
  </code></pre>
  
  <p>By requesting the cost of any of my machines (Ireland), it shows an error that it is <strong>not possible to connect to ce.eu-west-1.amazonaws.com</strong></p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 22, in &lt;module&gt;
      print aws.service.cloudwatch.client.get_cost_and_usage(TimePeriod=time_period, Granularity='DAILY', Metrics=['BlendedCost'], Filter=filters)
    File "/usr/local/lib/python2.7/dist-packages/botocore/retryhandler.py", line 359, in _check_caught_exception
      raise caught_exception
  botocore.exceptions.EndpointConnectionError: Could not connect to the endpoint URL: "https://ce.eu-west-1.amazonaws.com/"
  </code></pre>
  
  <p>Maybe this service is not available in Ireland yet?</p>
  
  <p>I cannot find "Cost explorer" / "Billing" / "Cost management" here:
  <a href="http://docs.aws.amazon.com/general/latest/gr/rande.html#awssupport_region" rel="nofollow noreferrer">http://docs.aws.amazon.com/general/latest/gr/rande.html#awssupport_region</a></p>
  
  <p>I'm using:</p>
  
  <blockquote>
    <p>boto3==1.5.2</p>
    
    <p>botocore==1.8.16</p>
  </blockquote>