Looking for a great and cheap way to Try Linux, or Unix?

I go on this site on almost a daily basis to check out the new flavors of Unix and Linux, I probably own at least 4 or 5 distributions currently and all have their ups and downs. I own Whoppix, Knoppis, Auditor and a couple of forensics CD's as well. This is a great way to get alot of tools for open source on one CD. http://distrowatch.com/