The cost of a post is often more costly than the cost of the sign itself. Then, when you look at the labor and time needed to hammer the post into the ground and then suspend the sign itself, it is easy to understand why the post and fasteners matter
Portable sign bases allow you to move your sign to just where it is needed. The Stop Sign message cannot easily be ignored. Order a post along with the base. Cast iron bases are heavy enough to resist tipping in the wind. And, if you want, you may even bolt the sign to the pavement or concrete.
Note, however that the MUTCD warns that portable or part-time STOP signs shall not be used except for emergency and temporary traffic control zone purposes. Signs bases, though, are found everywhere – inside factories, temporary traffic control for a school event, valets, parking lots, etc.