I buy LP's and then download the music via P2P.  Perfectly legal, no DRM BS, cheap, and I have a copy of the music with the absolute best possible sound quality.  Vinyl.
Rock on, Pink Floyd...  these albums ARE meant to be listend to beginning to end, not all piecemeal like today's music.  Artists who do this anymore are few and far between.  Even back then, Floyd was not exactly "common".  They are, always have been, and always will be, truly exceptional.  Shine on, you crazy diamonds.
And to anyone who says they're outdated, is that why they have the second most valuable back catalogue EVER?  They are one of the greatest bands in history, and their music has stood the test of time.  In another 37 years, young seekers will still buy Dark Side of the moon, listen to it front to back with headphones on, and get goosebumps from a truly outstanding work of art.  You wouldn't listen to a single movement from Beethoven's 9th, right?  Or from Mozart's Requiem?  This is no different.
To those who say it's about money - not likely.  The band members are so insanely rich, they couldn't possibly want for much more.  What they WANT is for their art to remain intact.