Unfortunately, in a few years DVDs will most probably be considered obsolete, and even now they are less and less popular, that's why they will only sell if they are cheap.

They even make a lot of new laptops without an optical drive these days: Q&A: Why do new laptops not come with optical drives? (ricksdailytips.com)

They are still making external optical drives you can connect to your laptop via USB, but not forever.