You have a number of options here.
To purchase one month of stoxpoker using a credit card, you simply sign up for a subscription using our automated process on the stoxpoker page. As your first month nears it's end, you simply cancel the subscription by emailing our support and requesting it is done. Depending on the details of your subscription you may have to go to paypal yourself to cancel it. The process is relatively simple.
You also have a few different options for getting stoxpoker (and also Cardrunners) for FREE.
If you don't have a fulltiltpoker account you can get the absolutely best rakeback deal around by signing up through cardrunners rakeback at
www.fastrakeback.com
If you already have a fulltiltpoker account, you can still get stoxpoker and cardrunners completely free by signing up for
www.trulyfreepokertraining.com