i donno i think the NEW disks should be sold because of the fact that you can't get them legitimately (talking to you mods) but i have heard you can get the new discs from creepers too but i'm not sure. [creeper]
in contrary to myself....
as of version 1.1 (Minecraft 11w49a)
it was possible to gain all music discs (with the exception of 13) from creepers when killed by a skeleton, i'm suggesting we can have that update on our server, or we can have more events that give chance of getting those newer discs