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Step 2 - purchase
Once you feel that you're ready to conquer the exam, head to https://www.openstack.org/coa/ and click on Get Started. After signing in, you will be directed to checkout to purchase your exam. The OpenStack Foundation accepts all major credit cards, and costs $300.00 USD as of September 2017 (subject to change, so keep an eye on the website). You can also get a free retake within 12 months of the original exam purchase date if you do not pass on the first attempt.
To encourage students in academia to get their feet wet with OpenStack technologies, the OpenStack Foundation is offering the exam for $150.00 (50% off the retail price) with a valid student ID. Check out https://www.openstack.org/coa/student/ for more info.