Most real estate firms work with the MLS/IDX services. I produce web sites and perform search engine marketing services, and include realtors as my clients.
If you are looking for a specific area of NC, try a yahoo or google search for "townhouses for sale in greenville, nc" for example or "wilmington nc real estate listings" and you'll find realtors with websites in your search results. Be sure to include the state code in your search.
You could also try starting with
Homes.com - Real Estate and Homes For Sale., then narrow it from there.