As mentioned,by bobbersdown,Ebay may be your best bet if you're looking to cut costs.
I Searched all the arch makers for my tower on my new boat,and got prices from 1,500 to 4,000 dollars.
I ended up having a custom arch made specifically for my brand and model of boat.It's 1.9 inch aluminum tubing with six gold anodized rod holders.Very solid I can hang on it(240lbs)with no flex at all.
It ended up costing me 1,800 bucks,and that included the freight, charge of 100 dollars from NJ.
I got several prices from custom fabricators that were well over three grand,but that was to much for my wallet.
Of course that included the installation and running the wires for the electronics.
I had to mount the arch,and run all the wires myself,but is was no big deal,and well worth the cost savings.

