After you know what Reserved Instances are available, you can purchase them.
The following is an example of how to purchase Reserved Instances for 3 m1.small instances using the ec2-purchase-reserved-instances-offering command-line tool.
ec2-purchase-reserved-instances-offering
PROMPT> ec2-purchase-reserved-instances-offering --offering 4b2293b4-5813-4cc8-9ce3-1957fc1dcfc8 --instance-count 3 PURCHASE 4b2293b4-5813-4cc8-9ce3-1957fc1dcfc8 af9f760e-c1c1-449b-8128-1342d3a6927a af9f760e-c1c1-449b-8128-1342d3a6927b af9f760e-c1c1-449b-8128-1342d3a6927c
Write down or save the reservation numbers for future reference.
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