I think the answer for both of these is that they have never been out on blu-ray, what about HDTV? :
SLC Punk
Pink Floyd’s The Wall
edit: Also, Before Midnight is out on blu-ray, just not the other two: http://www.amazon.com/Before-Midnight-Blu-ray-Yota-Argyropoulou/dp/B00DJYJQ36/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1463249122&sr=1-1&keywords=before+sunset+blu-ray
Pink Floyd - The Wall HDTV is on Rutracker.
Thanks! Just found two of them on there. They’re dead, but it looks like there are a few relatively recent usenet postings to try!
I don’t know what you’re looking at but I found three that aren’t dead and one has 57 seeds and the other two have 9 and 15 seeds respectively.