Registration is cheap - $60 for the whole thing. No, really. It's priced almost as low as Linux.
https://www.socallinuxexpo.org/scale9x/
Plenty of enticiing presentations, including one from Canonical's Ted Gould about the design goals of Ubuntu's Unity interface that premiers on the desktop in April.
If any of you are coming from the Pasadena area let me know and we can arrange a carpool to the conference location near LAX.