We’ve had a couple of beta testers say they do not have an AWS account on Amazon. We were kind of surprised!
If you do not have an Amazon AWS account, you can sign up for one easily at http://aws.amazon.com/. Signing up is free and you will only pay for the services that are used. As an example, if you do a load test of 50,000 users for an hour the approximate cost is $2.00 and would be charged to your account on Amazon.
Note you are paying purely for the raw Amazon EC2 charges (and you are getting spot instances). There is no fee from RedLine.