ester, I believe that the price difference comes when you pay for shipping. Curious Labs has to pay for hundreds of megabytes of download or making the inexpensive to produce CDs and paper, so I could guess these come out about the same.

I am, however with narsil and PheonixRising, that CD-R's don't do very well as backups. I recheck just burned CD's, but they still go bad, sometime as soon as a month later.

So, if you find that the shipping is almost as much as the product, or if you don't want to wait for the month it'll take to get there, be sure there are lots of copies!

Best of luck!