Papa Johns has a great online promo code that's good till July 4th.
Right now, you can take 50% off the regular menu price when you order online. Use promo code: PARTY50
Offer is good on items other than pizza, like breadsticks.
Enter the promo code before you start your order to verify that you're getting the discount. You cannot use the discount on specially priced items, just on the regular menu price.