Uniqlo is a good example because they had never changed their pricing no matter how up and down the economy went in the past decades. The fact that they are doing it now is actually very worrying as a trend for Japan. It means they had no choice but to do that.
As I drove by a barber shop on April 1st, they were changing their sign from 2500 yen for a haircut to 2900. A tad more than 3%.
The clinic my wife works at raised one of their monthly services from 7000 yen per month to 12000 yen!
That. And the government encouraged it. In 2004, a law made it obligatory to display prices with consumption tax included (税込み). That obligation was lifted 6 months ago. Guess what happened as a result. Displayed prices didn't change. Products at 1000 yens tax included (税込み) are now 1000 yens without tax (税抜き). 1080 yens out of consumer pockets, instead of 1029. 8% increase instead of ~3%. The flip side is that this makes for better margins for businesses.
Even businesses that did absorb the tax increase now claim to do a bigger favor than they are actually doing (that is, their 1000 yens service is still 1000 yens, but they advertize it's 1000 instead of 1080)
I haven't seen much of the kind of prices increases you describe, though.