[amsat-bb] Fiberglass Poles for Antenna Mounting?

In reading the descriptions of various directional antenna installations, I often see a statement that the last section of mast between the rotator and antenna is non-metallic (most often fiberglass, I believe).

What is the best source for a suitable length of fiberglass pole of the correct size?

I would not be surprised if the source is outside of the radio world... perhaps a round fiberglass pole intended for as a tool handle, for example. Just a guess.

Appreciate any suggestions.

Thanks!

-Scott, K4KDR Montpelier, VA USA