Foreclosures are posted on the Durham County website. Remember these properties are usually sold "as is" meaning no repairs done by the seller and you will likely be required to agree to terms that are not required in a normal transaction. Make sure you consider the cost of repairs into your offer price and be sure to hire a licensed inspector for advice.
You can use a licensed Realtor, and I would be happy to help. Here is a website that will give you some, but you do have to use a registed Realtor to bid on these properties, however there is no charge to use if I represent you.