I was at the San Dimas Costco today and saw they were selling front-of-the-line (Fast Fright) passes for the Queen Mary's excellent (in my opinion) Dark Harbor Halloween event 2 tickets for $74.99. This is a "savings of up to 49%."
It didn't appear to include parking.
You pick up a cardboard ad as you do for movie, restaurant or Universal tickets or certificates, then purchase them at the register.
As with Universal Hollywood's Halloween event, I wouldn't recommend the Queen Mary's party without front-of-the-line passes. (I think they're unnecessary at Knott's Scary Farm, if you go early.)