According to CNET comparison shopping, “Because of membership, delivery fees and tipping, you might think having groceries delivered is way more expensive, but the final tallies were remarkably close. And if you subscribe to the concept of time as money, online grocery shopping is surely the better bargain.”
Also, ordering online for pickup, rather than delivery, is usually free if the total is above a modest minimum (at Ralph’s, if above $35). Then the motorized cart is not an issue — only the motorized car!