Pence is the usual plural for an amount of money, although it's often replaced with "p" ("pee") when speaking informally. Pennies means 1p coins, sometimes 2p

Pence is the usual plural for an amount of money, although it's often replaced with "p" ("pee") when speaking informally. Pennies means 1p coins, sometimes 2p coins too: "Mum, I need sixty pence for the train, I've only got pennies and the machine doesn't take them." "Pennies" without an amount means a small amount of money. "It's only pennies with the amount we use it." (JK Rowling missed a trick. It should have been one bronze knut, two bronze knuts, and a price of four knets or something.)