Sixpence (2.5p) per bit is the cost of memory according to Core Memories quoted in the November 26th 1969 edition of Electronics Weekly under the headline: ‘Low-Cost Memory Systems Thrust.’
“The price per bit is less on the larger units and, in fact, falls to threepence per bit in the mass storage units”, says the report.
However a cloud was hanging over Core Memories, a subsidiary of the company, Data Products Group.
“The group reckon that cores will remain competitive for at least four years,” wrote EW, “but the challenge they face from IC memories was given point last week by the announcement at the fall Joint Computer Conference in Las Vegas of Motorola’s 8K metal-oxide-bipolar main-frame memory.”
You can get a 500GB disk for around fifty quid these days, which is (if I've got my powers of ten right) ten nanopence per bit. And that's before inflation.