This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Portal Server 7 is licensed at $57K (U.S.) per CPU or per socket, which entitles the customer to one CPU or one socket that includes a restricted use license for Sun Java System Access Manager, Sun Java System Directory Server, Sun Java System Web Server and Sun Java System Application Server. "Restricted use" means that those users accessing applications outside of the Portal are not covered by the license. Of course, the license can be extended to cover additional usage outside of the Portal.
With that steep of a price tag, I'm guessing you need to contact Sun in order to get an evaluation copy, as I can't see one on their website.