One of the many followers that you can get in South Park: The Fractured But Whole for your Coonstagram is Stan’s Grandpa Marsh. Before he agrees to take a selfie with you and becomes a follower, he needs you to do something for him and that’s to get him a condom.
To get a Condom for Grandpa Marsh, you need at least a $1 in your pocket. As soon as you are able to explore South Park, head to the Unplanned Parenthood.
Go inside the place and approach the receptionist to find the condom. Once you buy the condom, go back to Grandpa Marsh and he’ll now be able to take a selfie with you.