Ah. Know of any close to California? I've flirted the idea with building a quad Xeon setup and slapping on Windows Server for personal use. But my research says it's more cost effective in the long run to grab the highest clocked and highest core Xeons you can budget for. I'm on IB-E at the moment and it's a dead socket unless I go used for better parts.
superbiiz.com is based in San Jose. They seem to have the best selection and pricing. You can also try Newegg in Southern CA. Supermicro has a lot of options so it all depends on your budget and requirements. I wanted the most versatility and bang for the buck in a single socket since it's out of my own pocket so it worked out great.