Two Purina® Pro Plan® discount offers on the web page linked to below. One is buy one get one free and the other is save $3 on a bag of dry cat food. There appears to be no date for termination of this deal but there will be, I guess. It is a live deal at the date of this post. There is always a price and this time it is filling in a form! You will get some emails from Purina I am afraid but this is the real world.
This is the page.