Heroku Organization Accounts functionality has been merged into the Heroku Toolbelt and the heroku-orgs CLI plugin has been deprecated. Users that have the heroku-orgs CLI plugin installed will be prompted to uninstall it the next time the Toolbelt automatically updates. You can also remove the plugin manually using the following command:
$ heroku plugins:uninstall heroku-orgs
Organization Accounts are currently only available for purchase through our sales channel. Contact us if you would like to purchase an Organization Account.