You're right .. pick up CDs for less than 10p at car boot sales. Like you I had 100s of cds on several shelves covering a whole wall. A few years ago when I moved I transferred them from the plastic cases into plastic protectors which I bought a 1000 for about £2 in Malaysia. Now I get approx 80...
I went on an Amazon Alexa Developers Workshop last week .. the trainer put up a slide with just "250,000" and asked the audience what does this number represent .. all the usual answers like the number of echos sold so far, in a month, in a day etc ... No .. it was the number of marriage...