[Tervuren]

Most machine shops are pretty busy, and its hard to find good machinists, pretty easy to get hired if you are one, pretty much anywhere.

So what you're facing, is that shops will charge based on hassle, rather than simply cost of materials. A wheel is a pretty critical part to a car, and they need to make sure they get it right, even if it takes multiple tries. They have to factor this into a quote. Not to mention in this lawyery world, they could be liable if your design didn't work out.

I see this at my shop sometimes, they will quote 1000% of the cost, if they get the job, the money somewhat offsets doing a job they would rather not take, and if they don't, they still have plenty of business, and get to go home on time.

I'd expect almost anywhere you go, you're going to get charged extra for this, because its being used on a critical part of your car. The only way you'll get a reasonable deal, is to go to a place that works with wheels as their main production/living, they'll have the confidence to believe they can do it right, and will charge a more reasonable rate. Either way, its still not going to be cheap.