If there was a free agent kicker that could consistently execute completely accurate kicks and from deep range he wouldn't be a free agent.

Hitting an upright is not an egregious miss. That is literally missing by inches. We commonly see kickers miss by several feet. Besides, there are multiple factors involved in the kick. Was the snap perfect? Was timing and placement of the ball perfect? Was the footing perfect?

But, here's a listing of all free agent kickers.

Spotrac FA PK's