So are you interested in the cabs or the games? You can buy them separately, you know. For example in the Socal area there's Matsui. This is his email gamemachine2003@hotmail.com He's a reputable guy and many on the ng.com forums deal with him. There's also arcade infinity in Industry California. They have an arcade in Diamond Plaza I believe but they also have a warehouse where you can buy candy cabs. If you want the JAMMA PCBs then there are many places on the web to get them
http://excellentcom.net/main.asp
www.arcadeshock.com
www.neostore.com
www.viddeoconnect.com
www.coinopexpress.com
http://home.netvigator.com/~cosmicco/
And many others if you do a diligent search on the net. I suggest you go the latter route of buying the cab and then searching for the games you want as it can definitely get a lot cheaper than the former where you buy the dedicated cab with the game inside and with the latter, you can switch games inside the cab as long as you have JAMMA games.