I visited SparkFun Electronics recently in Boulder, CO along with Curtis Ellzey of Engineering TV. I got to speak with a number of people there including Nate Seidle, founder and CEO of SparkFun Electronics (Video. 1). The videos have all the details but I'll add a couple of tidbits here as well.
SparkFun Electronics is aptly named. The production and inventory facility is chock full of boards, components and modules. There are enough dogs and skateboarders roaming around to give the impression of Venice Beach rather than being next to the mile high city. The number of lab benches with projects strewn all around attests to someone having too much fun.
Often the projects are to test out or develop new projects. SparkFun sells components but also kits. They have parts for all sorts of things from robots to Arduino boards and shields.