Buying Cones. Decent size traffic cones range from about $8.50 to $12.50 each on Amazon. We recommend the durable "3M PVC Traffic Safety Cone, 18-Inch," or the "3M PVC Traffic Safety Cone, 12-Inch."We prefer the 18-inch versions that are nice for drivers as they're easier to see in mirrors, but the 12" versions are fine too.
