Hard drive memory
Many early personal computers had floppy disk drives instead of hard drives, but hard drives abound today, and most young people have no idea what a floppy disk is. Back in 1989, you could get a 60MB Seagate drive for about $449, putting the cost per MB at about $7.50.
Today, Seagate Technology (Nasdaq: STX) is still making hard drives, and you can get one with an 8TB capacity for $150 or so, putting the price per MB at $0.0000187 – quite a bit lower!