Shoppers is not a grocery store, so of course they’re going to charge more for things like peanut butter, when compared to grocery stores like No Frills or Costco. You’re paying extra for convenience, and they’re selling lower volumes. A better comparison would be peanut butter at convenience stores.
You’re forgetting about models that are open source and able to run locally. Llama3 is not the best model, but it’s still very useful and will continue to get better along with the top closed source models.