Try getting a new title through the legitimate channels before you go through one of those places that sells you one, they may or may not be looked upon kindly by the state.
This is from the South Carolina DMV website at
http://www.scdmvonline.com/VehTR.aspx
Obtaining a Duplicate Title
If you have lost your title, you may obtain a duplicate title from the Department of Motor Vehicles. You may apply for the duplicate title by mail. The Form 400, Application for Certificate of Title/Registration, which must be completed, contains the proper mailing address for the department.
To obtain a duplicate title, you must have the following:
* Completed Form 400, Application for Certificate of Title/Registration.
To complete the form, you must have your vehicle odometer mileage reading and any current lien information.
* Title Fee.
The title fee is $15.00.
Important note: If there is a lien on your vehicle, the duplicate title will be sent to the lien holder.
As long as the seller was the legitimate owner you probably won't have any problems, it'll just take some time for the paperwork to be processed. I went through a similar process once for a car I bought up here in Minnesota and it wasn't so bad.