If you look, you can probably find good quality grated parmesan for cheaper than the wedge. I was a "grate it immediately before use" purist until I moved to an area where my regular grocery store was a mom and pop Italian supermarket. I tried some of the various plastic boxes of grated parmesan, romano, and mixed (cheese ends from their deli section) cheese. I figured if Italians were willing to buy it grated, I should give it a try at half the price. It was perfectly nice.
May you live as long as you wish and love as long as you live.
Robert A. Heinlein