$3 on eBay, delivered within a few days.
The stuff I want to watch is rarely available on the very few streaming services I subscribe to.
As for piracy - ugh I really could not be bothered - what a waste of time finding and downloading and playing.
I'm pretty sure that any streaming service now will offer much better quality than DVD by default.
Unless you use a projector or something to watch your movies, in which case the details are sufficiently lost to not observe any real difference?
For those prices I'd wonder if you're getting the counterfeit versions?
I'm finding I'm snapping up loads of <$10 Blu rays from brick and mortar stores now too. I'm enjoying the more deliberate choice of a movie rather than endlessly browsing streaming sites.