I would recommend you purchase the ES7 from an authorized dealer. There are problems with people counterfeiting these phones... another option is posting a WTB thread in the sales forum here. If you search head-fi for the es7 threads, you can find a list of dealers known to sell the real thing.
The ES7 has become harder to find recently.. I'm not sure whats going on with its distribution. Audio Technica lists their authorized distributors, and I'd start looking there for a dealer who will ship to you.