Drumnasoo Car Sales. Used Cars Portadown, Armagh, NI, Northern Ireland. We specialise in good clean, cars at affordable prices and have a selection of makes and models in both petrol and diesel. Drumnasoo Car Sales. Used Cars Portadown, Armagh, NI, Northern Ireland also have a range of finance options available for the customer to choose from. Every customer will receive personal attention and a warm welcome when they come to us. People are free to drive in and look around without being put under pressure to buy.