NC Dept of Revenue offers Installment Payment Agreements. Per their information page, as part of the agreement they will not assess the 20% collection fee. This is not something that can be set up thru TurboTax, so you'll have to contact the NC DOR directly.
Here's the link to their information page regarding these agreements, including instructions and contact links: http://www.dornc.com/collect/installment.html. In addition, their phone number is 877-252-3052.