Our primary thing is a coding interview prep bootcamp, where we do a lot of practice and mock interviews with people who are working at or alumni of some very coveted companies in the valley.
We don't advertise, but we also do one-off mock interviews, both in-person and on phone or online.
There are also local meet ups for interview practice. What city are you in?
Also a plug for my own interview prep site. http://kelukelu.me/interview/