The availability zone is determined by the subnet in which you place the instance. Visit the VPC console and select the Subnets view. Make sure you're looking at the correct VPC, then note all the subnets available in that VPC and which availability zone the subnet corresponds to. Make a note of each subnet and its zone. Now go back to EC2 to launch the instance, and choose a subnet for the availability zone that has the instance type that you need. You may need to try a few subnets/zones before you find one that has capacity.
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