From the border it is a very short walk to Edeleen Dairy. If you want to catch the bus in Sumas it is 71x. Don't forget to stop by Sumas NAPA and El Nopal while you're in Sumas!
Its not far for an electric wheel chair from the border either, if you cant walk.
I don't know, try googling Whatcom Transit Authority for bus website. From border crossing it's only about 8 blocks walking south, on left hand side.
Don't know on the BC side, but once across the border it's within walking distance.
Thanks! Your answer is awaiting moderation.