There has only been one film I've been unable to find in our library system. It's an out of print foreign film and impossible to buy new or stream so I periodically would check eBay. Finally I found a copy at a good price and bought it.

The seller sent me a DVD-R in a case with an inkjet printed cover. I went out of my way not to pirate it and ended up doing so anyway. :(

In general though, our library has completely replaced Netflix for our house for ages. It's great.

https://en.wikipedia.org/wiki/Always:_Sunset_on_Third_Street