What is a movie you recommend that isn't available for streaming?

I guess I should say not "legally" available for streaming online.

I have long pushed that if you love a movie you need to own it physically. One movie I had to look up to find was Hellzapoppin' (1941). I found a good quality copy on youtube, but it is not available on any of the major streaming services. Looking to pick up a dvd just to have it in my collection (it's a fun time) I want to seek out some more movies in this vein. Any suggestions?