Mercerville, NJ Sheds, Carports, Garages and accessory dwelling Units for Sale Sheds for sale in Mercerville, NJ have an average price of $10287.50 with an average square footage of 324. The average cost per square foot is $31.75. ShedHub.com is aware of 1 dealers within 20 miles of Mercerville NJ. The most popular shed styles at these locations are High Barns, Mini Barns, and Garages.