Post to Summon Reyweld

pennies are not legal tender. You'll have to disguise them as something else.

Actually, you can totally still use pennies as legal tender. However, businesses have the right to refuse them. You can still use 50 cent coins too, but they are worth more if you sell them to a collector (like 50$ - 7500$ depending on the condition and date). A store would be dumb to refuse those.