When I was younger I used buy single records on 7" plastic. I've got a whole load in a box up in the loft, alongside the turntable that I used to play them on. Occasionally I get one out, look at the tiny wavy groove on it and shake my head in amazement that we actually used to store music that way.
Last week I really fancied hearing one of my old singles again ("Living by Numbers" by New Musik). So I searched out the YouTube video and had a very retro TV experience, even down to the blurred picture and muffled sound we used to get on our telly back in 1982. And then I wondered if I could still buy it. And it turns out I can. Amazon have links with vendors that sell all kinds of old stuff and so earlier this week the CD with the entire album ("From A to B") turned up in the post. (great album. Starts with a very convincing doorbell sound which actually had us checking the front door......)
This is called "long tail" marketing. There are probably not that many fans of New Musik out there, but there are enough worldwide to make it worth someone keeping a bunch of copies of the disk and sending one out every now and then.
Now I'm looking for some albums by Synergy.....