There were times when possessing even a megabyte of memory was a status symbol, and memory used to be the game of millionaires! Yes, millionaires! But it has been an exponential descent in prices since then and within half a century the price was come down to a magnitude of 10,00,000 times! Amazing how market dynamics operate in our industry!

These news clippings are epic:

Prediction: The cost for 128 kilobytes of memory will fall below U$100 in the near future.
Creative Computing magazine
December 1981, page 6

Twenty years later…

RAM (random-access memory) is now at record low prices, with many vendors offering 256-megabyte modules for U$50 or less.
San Francisco Chronicle, 27 September 2001

Here is a walk through history. From the days of $10,000/MB to 2004 (from 2004 to 2009 the cost/GB has literally gone down to negligable levels), take a look:

And this might be termed as the starting point of modern memory:

IBM RAM in 1956