Food, clothing, health care, TVs, computers, pretty much everything. Maybe housing is an exception, but it may also depend on where you live. At least building is probably also cheaper (more efficient methods).

Is health care really cheaper? It's obviously much better, more effective and leads to much better outcomes. However most of these medicines and procedures that gave us these better outcomes are very expensive.

I would expect the medical procedures you could get 50 years ago would be very cheap today.

But it is of course a relevant question how to measure.

I suppose you can also get a computer that is as expensive or more expensive than a computer 20 years ago. But it would also be a million times faster (or more, I am too lazy to look). You could also get a Raspberry Pie for 30$.