According to this TVshowsonDVD.com article, Amazon has struck a deal with Nickelodeon and Paramount to release various programs with a "burn-on-demand" system.http://www.tvshowsondvd.com/news/Site-News-Nickelodeon-Amazon-CreateSpace/10375
Essentially, a customer orders and Amazon burns a copy of their order to be shipped.
An interesting way to purchase DVDs. Amazon is calling it their "CreateSpace" program.