To add to the previous news post, the Sonic Underground boxset is also available on Play.com with this information.
A 10 disc box set including Underground Masquerade, Tangled Webs, The Deepest Fear, Who Do You Think You Are?, Wedding Bell Blues, To Catch A Queen, Mobodoon, The Price Of Freedom.
It will be £22.99 with free delivery. There’s also a picture on the site.
Here’s the URL
http://www.play.com/play247.asp?source=675&page=title&Cur=257&r=R2&title=185696