Previously as an effort to promote Ubuntu and Free Software, Canonical has made pre-pressed CD/DVD available for LoCo team to be distributed during release party or promo events.
But starting from Ubuntu 13.04 (Raring Ringtail), pre-pressed Ubuntu CD/DVD will only be made available only for LTS release (the next one will be 14.04 LTS ) from this point forward. This is in-line with Canonical policy to only concentrate on supporting Ubuntu LTS.
In the mean time, Canonical will continue to provide pre-pressed Ubuntu 12.04 LTS CD/DVD to Ubuntu LoCo until 14.04 LTS release in 2014.
source: Ubuntu Loco Council