Cooking classes in Bay Area
Thai cooking - I've been taking annual Thai cooking lessons in Oakland from Kasma Loha Unchit for the past 5 years or so (http://www.thaifoodandtravel.com).
Indian cooking - It's been a few years since I've taken a class from Ruta, but I would certainly recommend doing so. Like Kasma, Ruta also teaches from her home in Oakland http://www.rutaruta.com.
I too have tried to find Bay Area cooking classes without having to pay a huge amount.
So far my findings have been very scarce, but I did stumble upon this cooking site where you may view FREE cooking videos by typing in the recipe into the search bar, hope this helps you as it has me!