My question involves real estate located in the State of: north carolina

Hi - I bought a lot in north carolina and we agreed on the price and signed a contract on Wednesday. On Thursday the lot next to the one I bought was listed on MLS and the price was 30% lower than the price the developer had shown me that it cost. Earlier he told me there was lots of interest from people and builders in the lots yet they cut the price when they listed it. Do I have any ability to walk away from the contract I have signed (have given them 10% earnest money as well) or any ability to try to get our price lowered? Any help much appreciated thanks!