If things are so dire you're considering a dental drill it's well worth checking with local machine shops. You could also ship it out to a shop with the right equipment. Or, if appearance is much less important than functionality you could have it cut then welded locally.
Depending on the exact use case you could have a replacement fabricated. Several national fabricators will 3D print or machine parts from CAD plans. There's a menu for requesting quotes in Fusion 360, which is free for hobby use.
You could also have it cast at a foundry, I've no idea where that would fall on the price spectrum. I suspect it varies wildly from one shop to the next.