18 Inch Aluminum Stop Sign, Heavy-Duty Traffic & Road Sign for Streets, Parking Lots & School Zones | Easy Installation for Municipalities, Contractors & Homeowners 18x18 Inches - 1 Pack is up for auction in Patio, Lawn & Garden. The current bid is $5.50, 80% below the $27.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.