McMaster-Carr sells a 0.051mm drill bit (0.002 inch) for $25: https://www.mcmaster.com/8904A11/

Here's links to other other micro drill bits and micro end mills:

- https://www.mcmaster.com/micro%20drill%20bits/

- https://www.mcmaster.com/micro-end-mills/mill-diameter~0-002...

I used to work for a company that resold products from this company, they sold them for roughly $50 a bit. Pricing was highly dependent on shape, size, tolerance and order quantities.