Vancouver, BC to Mount Vernon, WA buses and trains from $17

Or, see buses and trains from Mount Vernon, WA to Vancouver, BC.
Here are some trips other travelers have found on Routefriend.
$17
2h 34m
0 stops
Amtrak
$34
5h 55m
1 stop
Greyhound Amtrak
$62
7h 30m
1 stop
Amtrak Amtrak
$73
9h 12m
2 stops
Greyhound Amtrak
$131
10h 34m
2 stops
Amtrak Amtrak