I don't think you can buy the demo anymore. I had thought they pulled it awhile back ago, but I could be wrong? Maybe you bought the Add-on's like Spitfire said, but I dunno how you could do that without the actual game disk? (I've only ever bought updates when I had the actual disk, so I dunno if it's possible to have the Add-on(s) without the actual disk in your PS3?)
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