Best source for a hot dip steel post?

[Cagary]

I'm looking for one post at least 12' long with a 4 bolt bottom square at the base.

-Veritas odium parit”(Terence 195–159 BC))-"Truth begets hatred".

[Eric1600]

Try White Cap, Miranda Country Store, Island Wide Fencing or just getting something from Hilo Steel Works and welding the fitting you need on the bottom.

[kalakoa]

Miranda's makes custom gates, they could probably fabricate this pretty easily.