FWIW: i've got a basement full of half- and fully-built projects with parts from this place:

https://www.servocity.com/actobotics

Granted, its not like Intel is allowing me to use there metal deposition printers, but there's a lot of good stuff there. I think they know me by name at this point.

Same with this place:

https://www.robotshop.com/en/robot-parts.html