They absolutely don't want to make automatic comparison shopping that easy. The goal of every grocery store is to get you there with one or two specific good deals they advertise and then have you do the rest of your shopping there because nobody wants to go to a second store and MAYBE get a slightly better deal but also maybe get a worse deal.

But also I’m blown away that most grocery stores don’t list inventory and prices on the website. I can only think this is because they don’t want to show prices in an attempt to get you to go to the store.

yuuup.

I mean... Yeah? Grocery stores want you in the store. If they didn't they'd be shipping only warehouses.