You mostly do NOT need ANY kind of PC Disc from many years now. Just registering the unused key on the service (Steam/Origin/Battle.net/etc.) and there you go - the game is directly downloaded from the publisher's "Content Servers" to your PC, ready to be installed or already installed.
People, who still believe that "disc" is the "graal", are retards. Only for console discs/games you still need 'em, but this should/would be changed soon again (in few years). Website like http://www.onlive.com/ will change that.