How do I reject the State e-file option, as it is priced at (another) $50.?
To not pay for state now you can delete it. https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-delete-my-state-return-in-turbotax-online/00/25895
Before TurboTax sends your return, it will ask you which returns you want them to send. Make sure only Federal is checked.