GameFly offers the used South Park: The Fractured But Whole for PlayStation 4 or Xbox One for $17.99 with free shipping. That's a $5 drop from our new mention from four days ago and the best price we've seen. (It's a low today by $9 for a new unit.)
The planet will thank you, your local (overwhelmed) landfill will thank you. Even your budget will thank you.