California Polytechnic State University-San Luis Obispo to The Art Institute of California-San Francisco buses and trains from $39

Here are some trips other travelers have found on Routefriend.
$39
5h 4m
0 stops
Amtrak
$42
7h 10m
1 stop
Amtrak BART
$48
6h 15m
3 stops
Amtrak BART
$48
6h 19m
3 stops
Amtrak BART
$48
6h 15m
1 stop
Amtrak BART
$49
7h 1m
1 stop
Amtrak BART
$49
6h 15m
2 stops
Amtrak BART
$49
6h 19m
2 stops
Amtrak BART
$49
4h 55m
0 stops
Amtrak
$50
9h 37m
3 stops
Amtrak BART