There is a need for this type of product outside of 3D printing and laser cutting. The quoting process is way too cumbersome with large swings in pricing and quality. I run a small wire component manufacturing company. The only website I have seen who tries to hit upon the larger manufacturing market is mfg.com. And like other web companies that cater to manufacturing companies (thomasnet) they charge too much. If you ever decide to pursue this further don't hesitate to reach out. You could probably start out just mailing a list of projects to manufacturers.