Resources

My BOM Excel Sheet I send to Contract Manufacturers BOM_Master

MacroFAB https://macrofab.com/
PCB production and assembly for prototypes

FindChips https://www.findchips.com/
Check inventories, price trends, EOL issues.

Component Search Engine. A great source of component footprints https://componentsearchengine.com/

3D Content Central http://www.3dcontentcentral.com/
Great source of models for 3D design