Ask HN: Best Commercial Retailers for Individuals?

The current pandemic and this post[1] made me more attuned to commercial supply chains. I'm collecting a list of ones that would be useful even after a return to normalcy (home delivery preferred). So far I have:

Amazon Commercial

McMaster-Carr

Baldor Food

Which others should I know about?

[1] https://news.ycombinator.com/item?id=22875465