RVParkStore.com has 1 RVs for Sale in Middlesex County, NH. Find the perfect RV, camper, or motorhome in Middlesex County, NH. The current average listing price is around $17,750. RV prices in Middlesex County, NH have remained unchanged at approximately 0% compared to the 12-month average price of $17,750. Listing prices currently range from about $17,750 to $17,750 depending on the size, age, and mileage of the vehicle.