California Polytechnic State University-San Luis Obispo to University of California-Berkeley buses and trains from $43

Here are some trips other travelers have found on Routefriend.
$43
6h 42m
2 stops
Amtrak BART
$45
5h 39m
1 stop
Amtrak
$47
6h 37m
2 stops
Amtrak BART
$48
6h 37m
2 stops
Amtrak BART