Go right to the source ...Verizon. Ask anyone ...lineman, or office, after the December storm last year, there was a glut of phone poles available.
We got a few for our Gun Club by contacting the local PD ...who are Members. They had connections to get them. And they were happy to be rid of the broken ones. 25' is a fairly lengthy pole, but those were available too.
The other place that had 'em stacked up was the local transfer station (dump). Towns in MA North and West of Worcester must have some kicking around.