I buy my parchment paper by the truckload, and I suggest you do too! Parchment protects your baking sheets and cake pans, greatly extending their life. It's also useful for making paper cones for decorating. These sheets are so much more economical than buying the small rolls of parchment from the store, and they're already sized for half-sheet baking pans, so you don't have to worry about tearing off the right amount.