I’ve got a $30 budget, how should I spend it?

I know $30 isn’t too much to work with, but it’s money my brother gifted me for my birthday with the one condition that I spend it on RPG stuff.

How should I spend it?

I’ve been looking at Spire, Blades in the Dark, Cold Shadows, Tales from the Loop, and a few others. I definitely lean more narrative than crunchy. Should I do PDFs? Getting a physical book would be nice, but it might not be worth it. Should I get one bigger book with a lot of content, or a few smaller books/PDFs?

I’d be willing to maybe spend $10 or $20 extra, but that is about it. Any ideas?