The poster above is from the late 1980s. HMV were barking mad, because they were selling new chart CDs for £9.99 in their sale.
35 years later, I still balk at paying more than a tenner for a new CD. Inflation is in the news a lot these days, but the cost of a CD seems to have been immune to 30+ years of price increases. Of course, CDs were grossly over-priced back when they were first released, especially compared to the mass-produced market-leader, vinyl. That's turned on its head now as well. The renaissance in record collecting, combined with a world wide vinyl shortage, means you're now paying up to three times as much for an new vinyl album as for a CD... which would have been unthinkable in the late 80s.
I can never get my head around inflation. The idea of paying nearly a pound for a bar of chocolate (that is smaller than the ones I paid 15p for when I was a kid) is almost enough to put me off chocolate forever. So I guess I should be grateful that CDs appear inflation-proof. For now, at least... until the hipster collectors ruin it for us all. Watch out. That day is coming.
From 1980, here's the only single (though it was a double A side) from Irish punk band The Threat. I'm not sure it was ever released on CD.
