Archival Disk

[knucracker]

With an ever growing collection of 'permanent' things to store (pictures, home movies, source trees) something like this sounds appealing:
http://www.sony.net/SonyInfo/News/Press/201403/14-0310E/index.html

But, want to bet each disk will cost $100 or more?  I'd hate to coaster one of those if it does....