以下からダウンロード
http://peak.telecommunity.com/dist/ez_setup.py
＜2013.11.28追記＞
現在(2013/11/28)の最新版は以下のようです。（情報ありがとうございます！）
https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
$ sudo python ez_setup.py
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