I've not seen such a list, but it sure would be handy. As far as what they stock, they have souvenier items such as clothing, post cards, key chains, magnets, bags and blankets. They also have basic grocery items including milk, bread, cheese, snacks, and beer and wine.
The prices are definitely more expensive than at the grocery or discount store.

We try not to have to purchase any food items there. When we were there in May my husband
almost purchased a 6 pack of beer, but we decided it would be cheaper to go out of the world to buy it - even with the price of gas.
Happy Camping!