Sometimes I spend close to $2k a month at McMaster for work things. They are literally a modern marvel. I order something at 6pm . It's there at 9am the next day.

I buy things from them even if it's double price, since I know there's no drama with their orders. It just works. Everytime.

They are the defacto standard that I have for a great e-commerce experience. When I need design /UI tips for my website. McMaster is always referenced. Never Amazon...