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I was just reading this article about a mathematical understanding of closed time-like curves.
In essence, the argument is that time travel to the part is possible with a degree of free will, but you would not be allowed to alter the part in such a way as to remove the motivation for traveling back in time. E.g., it would be like Futurama where Fry kills his grandfather, but he impregnates his grandmother, this allowing himself to be born. The idea is that the timeline would correct itself and ensure that your future self will always return to the past.
I think the deal was $13 per pizza when you buy two. Toppers around me has a similar deal that is always available. One large specialty pizza is $23, but they have a deal where you can get two large pizzas for $12 each instead. A small order of sticks is $10, and a large order is $15. So two large orders of sticks (which are the same size as a large pizza) with two large pizzas with the deal would be about right.