Well, I don't know what they'll look like, but I know how they'll work:
Cost for soda: free
Begin purchase
Machine: I'm sorry, but your purchase has been repriced. New cost: $1.00
Cheers.
Well played.
I was thinking:
Making new, close 'friend' at TSA Priority Line Pat Down - free
Warm sugar water - also free
Failing that drug test at work - priceless...