I don’t know that this applies to Papa Johns everywhere, but I got a great deal for a coupon on a box of pizza!
The next time you make home made pizza, take a picture of it. Then you can e-mail the picture to firstname.lastname@example.org. Include the phone number of your local store in the subject line. Within 4 days they will send you a code for $5 off an online order of $15 or more.
I know this will work for my local Papa Johns, so you may want to call yours and see if the same applies! If not, make sure next time you want to order pizza you check Retail Me Not  for codes for Papa Johns!