McMaster-Carr's fulfillment services are truly top-notch. There have been times that I've specifically ordered from them because I knew that I'd have it the next day. They've never failed to impress me with their service.

Their physical catalog is one hard catalog that I really miss! Despite the fact that the website undoubtedly offers more product than the multi-thousand paged hard edition, I remember many projects in my college days inspired by simply flipping through it's pages.