It's no secret that grocery stores and companies make consumers pay for convenience. Often, that convenience comes in the form of things like pre-chopped products, such as cheese. However, avoiding these things and just heading straight to the deli can save a lot of money, and it only really takes a few minutes of your time. In addition, the quality of whatever it is you're buying is often better, too.
You can also just buy complete blocks of things like cheese and shred it yourself when you get home, which will give you a bit more versatile in how you can use it.