It's like using Alexa to shop, or when an Amazon ad comes on it and saves to the cart, only your order has a delivery cost and it's perishable
Press the "Gatorade" button, and Gatorade shows up at the front door the next day. Except that it might cost you $2.49, or it might cost $12.88. There was no way of knowing beforehand.
(Those things were awesome tech, BTW. You'd program it with your phone via the equivalent of an acoustic modem.)