I've been dealing with Digi-Key for over 20 years now.
Their engineering support is excellent, and they are the go-to for me.
I'm a component engineer for a U.S. based automation manufacturer, and will continue to use them every day!
Tip for consumers: The parametric search capability is the best in the industry.
If you're looking for any sorts of electronic parts, this is the place!
Products used: I have purchased semiconductors, passives, connectors, wire, tools, chemicals, and anything else that is used in electronics.