Fathom

In the past we had used Shapeways but their estimated ship date was 1 month out and we needed our prototypes much faster. We went looking for other services and found Fathom. These guys are great! My rep, Ben, is super responsive via email (often within 5 minutes) and very helpful getting my files quoted. HUGE PLUS over the other companies is these guys are able to print in a range of very flexible silicone like materials.
What prompted this post was a reorder (I had to modify the design) that I needed rush shipped. This was on a Tuesday. They said there was a $ 250 rush charge to have the part printed and shipped next day or I could stick with the standard processing time and would have my part by Saturday. I opted for Saturday and paid for rush shipping ($ 20 extra in CA). Well it is Wednesday and I just received an email that my parts have shipped and should arrive Thursday!!! I was floored and had to jump on Unilocal to share the awesomeness that is Fathom.
I don’t know if Sonny F has done a lot of prototyping in various materials but I found Fathom to be an excellent value for what they deliver. The turn around time is second to none.

Was recommended this place by a coworker for their 3D printing services. He claimed they were affordable, so I promptly contacted them. However I was shocked to find the price they quoted me was 10 to 11 times that of the other companies I contacted.