Front porch post need replacement

I need to replace post but the one the builder used I have not been able to find, the finial & post are all one piece. I have tried all the usual lumber places lowes, home depot, Tarp, lumber yard off Catoctin & they have nothing like it. I hate to have to replace all 4 post any suggestions are appreciated.

 

We had the same problem and just cut off the finial pieces (only had 2 though) and bought wood finials at Home Depot or Lowe's, painted them white and attached them (don't remember how this was done - screwed in?). We've since replaced the entire front porch railings/posts but it was a good fix.