The game is now online as a pay-to-play product, and should be available at some retail locations (EB, GameStop) today. Major credit cards currenty accepted (Visa/MC/Amex/Discover), and we should have PayByCash up in the near future to accept PayPal, etc.
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No retail purchase necessary, you can download the game directly from us and start playing right away. But, if you buy the game in stores ($29.99) you get 30 days free, plus a bunch of snazzy extras (printed manual, nice poster, etc).
We have a free trial right now, which is 8 hours of in-game time. Once that is up, you need to pay $9.99 or sign up for one of the other block payment methods.