[Porchdog]

Castings would be essentially to size, just requiring clean up and polishing. Pattern making for the casting would be the greatest cost. If you are supplying a sample they can probably cast a resin pattern from it, which could be a bunch cheaper.

Since they were originally cast the sample will already have draft - the pattern guys will just need to add a sprue and vents. For that matter they might just be able to use your part for a pattern. There are still small foundries out there doing custom work.

They might even lost-wax cast a part like that - for the size I expect that would be more expensive.

There are also casting houses out there 3-d printing patterns. Since you have a sample I suspect that wouldn't be a savings.

I can model one of those for you. The cheapest 3-d printing is likely by Shapeways or a similar company. We have found found good strength with their "Strong and tough" plastic. I wouldn't be surprised if they want $400. each for those - but you pretty much need to submit your model and get a quote.

3D metal printing is still pretty expensive especially for something that large.