So optical media, right?
A DVD-R holds 4.7 GB and costs, what, 20 cents? Less in bulk?
Doing optical media mixtapes gives me enough room for a 90-minute album, two hours of video, a game, and a website to introduce and contextualize it all, for 20 cents.
Add a case and a booklet for less than a dollar, and I still come in way under the price of USB drives.
But then folks have to have optical drives.