Sourcing CNC machined parts

Several of your parts are listed as (Machined) indicating (I think?) that they should not be 3D printed. Do you have any recommendation on where to source these parts, or what the approximate expected cost would be? Any suggestion as to the parameters (materials, tolerances, etc) when placing an order for these parts?

Am I missing any parts from this list of parts that must be machined:
4x Heat Sink
3x Aluminum Leg for 4x Magnification
1x Alignment brace
Main Body
Cam ring
4x Heat Sink Height Adjuster
Lab stand plate
Machined part – Reservoir Assembly Jig Vacuum base