Use a proxy. I suggest that you represent pennies by milligrams of phytosterol. Few foods have a value. Go to foods, select “edit a copy”, choose an appropriate serving size (perhaps “pound” or “100g), enter the cost in pennies as milligrams phytosterol. Change the name to something like “My broccoli, raw” as a reminder that this is edited to reflect cost. Select phytosterol as a targeted nutrient on your profile so it will show on your diary.
You could use water instead and conserve all the nutritional information but then you would have to edit every food you log to diary. With phytosterol you can mix and match without distorting your cost total since very few foods even have a value and those that do have small values. Using micrograms instead of milligrams would wash those few errors out (that is, enter broccoli $1.48/lb as 148000mg instead of 148mg).