Styrofoam turn stones (Brooklyn)

I'm looking for old Halloween party City tombstones that were like a gray they were like almost like 2 feet to almost 3 ft tall and they were like Styrofoam they were like party City I'm trying to do a project for my church like a Halloween project for this coming year and I like to get everything ready before Halloween so we go throw a cool birthday party and Halloween parties and everything so does anybody have any styrofoam big tombstones my name is Joe thank you