There is so much money in so few hands it needs to drive up prices of everything to find a place to go.
The recent(-ish) resurgence in music cassettes is of course partially the usual hipster douchery, but it's also to do with how using a walkman makes people feel in control again. The experience of listening on a device that discourages skipping to the next song, switching to an artist that this song reminds you of, checking your notifications, and generally takes choice _out_ of your hands, is both relaxing and at the same time more intense in the ways that matter.
This is the same for video games, DVDs, and other physical media. Obviously there's the fact that you actually own the object too, and a streaming service can't take it away from you.
I do recommend estate/moving sales and regular old garage sales. I have found some pretty solid stuff. The estate/moving sales also have good pictures so you can filter through the bad ones.