Earlier today Bulgarian black metallers Claymore announced on their official MySpace profile that their music will be available on 39 digital stores including iTunes, Amazon MP3, eMusic, iLike, Last.fm, Wal-Mart (Liquid), Napster,
Rhapsody, Spotify and more. Formerly, it was only available digitally from Forces of Satan Records - an initiative taken by Infernus, Gorgoroth, and Vile Horg, in early Morning June 6th 2006, to found a media company/record label. No more physical releases are available.

Sources:
http://blogs.myspace.com/index.cfm?fuseaction=blog.view&friendId=178529586&blogId=538436890

http://www.forcesofsatan.com/index2.html
http://forcesofsatan.ithinkmusic.com/my-store/detail.php?page=LR&r=9081