if I were to just go to the store and buy a CD or buy a DVD.

比我去商店买CD或者DVD便宜。

音乐市场的变化 - SpeakingMax英语口语达人

Because ultimately you want to be making your own DVDs and CDs, instructional stuff about yourself.

因为你最终是想出自己的DVD、CD，以及个人传记。

想学音乐吗？ - SpeakingMax英语口语达人