Sign up for free AWS account: http://aws.amazon.com/free/
Once account is made and a phone call verifies your identity, a $1 test-charge will go to your credit card.
It is just a verification. The charges won't actually remain and will time off your account in a few days (the time varies depending on the card issuer). Amazon puts it through in a way that puts a "hold" on that amount, but it never gets processed as a payment and the hold eventually expires.