♫ Eric Herman ♫
I like elephants. I like how they swing through trees.
This isn't official but I would assume that supply items like that should be unlimited. I would just use pennies or something else that is convenient to track it.
That's what we determined as well in a recent game where we didn't have enough gold (right before I played a double gold card with a 5 and 6 rolled!). Until the gold was replenished, I just grabbed the right number of foods or cannons (minus one) and put one gold on top.