San Diego, CA to Lake Havasu City, AZ buses and trains from $68

Or, see buses and trains from Lake Havasu City, AZ to San Diego, CA.
Here are some trips other travelers have found on Routefriend.
$68
12h 1m
1 stop
GotoBus Amtrak
$85
15h 22m
2 stops
GotoBus Amtrak
$87
9h 43m
1 stop
Amtrak