If you mean the program that I use to work with Krystal, I got Poser7 from Amazon.com, they were having an $80 mail in rebate after purchace. that set me back about $180. Some people use Daz3D because its free but the quality and features you get from poser (That Daz doesnt have ex: shirt manipulation) are well worth the price tag. If you want to know where I got Krystal Herself, here's the website (she's Free)- [link]
Then I would recomend visiting Daz3d.com The program is free and comes with the basic features you will need to get oriented with rendering. but I would definately keep looking around for Poser 7, there is likely to be a price drop considering that poser 8 was just released. They usually do that to promote their new product. If i hear anything about a sale I'll et you know or post a journal about it.
She looks awsome by the way
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Let me know if you need anything else.