​There are few circumstances ​these days in which a commercial vendor would find mass distribution of Linux DVDs to be commercially viable. The business model has gone the way of Blockbuster.

Consider that a growing number of laptops and even desktops don't even have DVD drives built in, and encourage the use of USB sticks that are reusable; I have a specific stick that always has the most current version of Mint. not every system has a drive anymore, but most of them can boot off a USB stick.