Foster, PA Sheds, Carports, Garages and accessory dwelling Units for Sale Sheds for sale in Foster, PA have an average price of $5181.25 with an average square footage of 155. The average cost per square foot is $33.43. ShedHub.com is aware of 1 dealers within 20 miles of Foster PA. The most popular shed styles at these locations are High Barns, Mini Barns, and Garages.