The Home Alone post got me thinking about prices in movies.
I thought of the scene in The Running Man (1987) where one of the characters is buying a $6 drink from a vending machine and she runs out of change after putting a handful of coins in the machine. The movie is set in the near future of 2017, so drinks from a vending machine being $6 at that time is plausible. The character even says "Six dollars, geez, this place" shows that the high price is still notable in 2017.
Depending on the drink, I'm paying $.60 for a can or $1.25-1.50 for a bottle. Our local grocery store has a machine that sells generic drinks for $.35. The college campus has machines that sell energy drinks, juices and chilled coffees for around $3. I'm sure $6 drinks in a vending machine already exists today in some places and will still exist in 2017. So the movie is in line with current prices, no problems yet.
The part that seems quaint today is that the machine only takes coins.