There is a site that has Silo 2.0 for $24.95, downloadable only.  OEM (softdepot.com) has reputable programs (I purchased Poser 7 there for 14.95 rather than Smith Micro's 59.99 sale they had going during the time frame that 8 came out) and they are legitimate applications.

 

They have Silo, Poser, Zbrush, and other programs that aren't the most up to date versions, but if you are wanting to try them out without having to fork out the cash for the latest and greatest, that's a great place to hit.