you're right about the 3km walk to the hill, but on their website for the 07/08 season, it's $53 for an adult during "peak period", $50 normally, and $49 for youth during "peak period", and $45 for youth during normal times.
Not a huuuuge amount more than grouse, but seasons passes are the same price as whistler this year, though...
And seymour is dirt cheap...