Reminds me of the one-button Amazon magnets that you'd stick to the refrigerator.

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.)