Just the lowest price in the first row of Google shopping. Admittedly unscientific. Just trying to get a ballpark sense for relative prices.
As noted elsewhere, I’m an empty nester. Cooking for two adults, both of whom are athletic and celiac, so my perception of what’s cheap is WAY skewed. We eat lots of fish, chicken, and fresh produce.
I used the McDonald's app, creating an order for drive-through pickup (they don't seem to put prices on their website that I could find). So, I believe that should be their regular menu prices. I didn't look at 3rd party websites or apps because of the extra expense.