If you have the 3D model, you could 3D print it in Steel-bronze mixture from Shapeways. From the size of it, I assume it would cost about $30-40. It has a +/-1mm accuracy though because it comes out as a "green" soft clump of powder glued together, then they heat it in an oven to melt the glue and infuse the bronze. I used this method for printing my FD adapter. This material is kind of brittle though, they warn not to use this for structural loads. The aluminum print is stronger and has a +/-0.2mm accuracy since it is laser sintered aluminum powder, but costs twice as much as the steel-bronze.
https://www.shapeways.com/materials/steel
https://www.shapeways.com/materials/aluminum
You can also get it CNC machined with Protolabs, the part is small, so it's usually the minimum $100 cost. Done in 3 days.
https://www.protolabs.com/