I've thought about this question for the last three hours...

Since it is only $20, it would seem logical to get a movie, as they are usually right around that price. So you'd not have to fork out any of your own cash.

But, you can find games sometimes discounted to under twenty. Since they start out being prices at $60, getting a discounted game would not only cost you none of your own money, but net you the largest savings.

Unless! you can find a movie box set that is normally $60, but is now priced at $20.

...

I don't know. I think I'll go back to thinking.
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Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris