Ferries to BC will be more expensive but if you wanted to get on a ferry from say...Seattle to Bremerton or Edmonds to Kingston its 5.00.
Ferry to BC from Anacortes will be about 21.40 (winter fares...summer fares not posted yet).

WSDOT ferry fares

From what I remember the ferry from Anacortes to Sidney only sails twice daily. Early morning and mid or late afternoon.
Ferry from Port Angeles has three sailings but then you guys miss the ride thru Kitsap...BUT we could do that on Monday with FJ.

The cool part...no reservations needed for motorccyles on BC ferries and with all ferries in Wa motorcycles get to go to the front of the line.

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