You can go to the county website at and with the property address or owners name locate the tax bill. Under ONLINE SERVICE, click on REAL PROPERTY RESEARCH. You'll be able to search for the property by the location address . Once you have the property data you can click on the DEEDS tab to see a list of sales on the property. If you multiply the Revenue Stamps paid by $500 you should have a close approximation of the sales price.
A real estate professional can help you get much more informtion about a property and all sales in the area.
If you go to google and type in North Carolina property tax records, you will find websites that will give you access to the property records online. I am in CT, so the sites we use are different. Good luck!