Woo-hoo! It took a little work, but I finally grabbed a screenshot of the Crystal Buzz Cola vending machine from The Simpsons Cartoon Studio for Windows.
¡Ay, caramba! It’s an unused texture for the Buzz Cola machines in The Simpsons: Hit & Run! Of course, the version that actually made it into the game is already in the archive. [Source]
Buzz Cola: Twice the sugar, twice the caffeine!