Generally speaking, we are in deflation, not inflation. So as the commenter correctly points out, a lot of things are decreasing in price.
Here's the problem: our wages are also decreasing.
Here's another problem: a lot of things -- especially thing which we are *legally required* to buy from one source-- are increasing in price. So housing, electricity, union leadership, health insurance, the cost of government, public schools, taxes, bailouts... all are crashing through the roof.
Basically, if the purveyor thinks he has a captive market, he's grabbing everything he can.
But, that being the case, the appropriate question is not as the original headline, "how many things haven't increased in price in that long", it is instead, "how many things, when they increased in price 25- to 50-%, did you have the option to not buy, and still continued to buy?"
Typically speaking, when something went up in price 25- or 50- percent, I stopped buying it. That is, my purchases went to something like 5% of what they had been before. Often, I stopped buying it completely, because I had the incentive to find better alternatives. Once I had the better alternatives, I was done.
Here's a better question: in today's era of retail cannibalization, how will Amazon's market share hold up if they increase prices?