From tfwiki.net: The energon cube is the safest form of energon, used for transportation and storage. I went to my friendly neighborhood Christmas Tree Shops and found these. These are Refreezable Ice Cubes in pink. They are one dollar for 20 cubes and scale well with CHUG and maybe Masterpiece. (Feel free to qr scan this) Thank you for your time.
Interesting. I've been looking for something to use as enrgon cubes and didn't think of those fake ice cubes. I'll have to see if any of my local dollar stores carry them.