Here are ways you can get to Seattle Premium Outlet

Take Interstate 5 to Exit 202 (116th Street, NE). Take 116th Street, NE west to Quil Ceda Blvd. Seattle Premium Outlets is located next to the Tulalip Casino.

Each trip costs $43 us but it does stop at Seattle Premium Outlet.  You can save 5% when you book your tickets online.  Reservations required, at least 24 hours in advance.

Another site you can book with Quick Shuttle Bus.

Here

There are regular bus lines running from Vancouver, BC Canada to the Tulalip Resort, please call the concierge at Phone Number 360.716.6310 to arrange transportation.

If you prefer you can take the limousine bus that's about $700 per trip to the outlet

Information from The Tulalip Resort | Seattle Premium Outlet | Ride Booker