Any engineering company with milling facilities will be able to do this for you if you can supply the CAD design files, do a search for 'Precision engineers/engineering' They can even do the design work if you want but will of course charge. Materials will be available to your choice, they'll just buy them in. Enclosures can be easily milled from single aluminium billet but there's a lot of CAD work in that and if you need 5-axis work done then that'll limit suppliers a bit.
For single, the cost will be high, and you'll no doubt pay for any material they'll be left with so ask about this and get it shipped to you along with the product. You'll need volume if price is a worry at all.
This lot have a good website with decent info including design rules etc:
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