I think you'd have to agree that any time you apply technology to a particular "problem", the cost of solving that problem goes down. As technology progresses, the problems become cheaper and easier to solve. And now I can go to Walmart and buy a chair for $5 instead of fashioning one out of oak. Or I can buy a $12 electric stand-up lamp, instead of burning whale-oil in a hand lamp.
So, although oak and whale-oil is never going to be free, the cost of sitting down and having light at nighttime, is essentially free at this point.
* A good example is personal servants.
This is not an example of technology. But alas, these days we do not require a servant when I can pop a TV dinner in a microwave and eat a meal in 5 minutes.
* A similar modern example is education. The cost of education will rise over time unless we can provide the same education with less labor investment
Ever visit http://www.khanacademy.org/ ?