For Jon Snow and other out of towners: I am looking into Tukwila International Blvd parking area for the light rail - near SeaTac. I haven't found the prices yet, but it has to be less than the $45/day Jon paid during our meetup. The light rail pass would be about $2.75 ea way. Don't decide to break a $20 at the ticket machine unless you want to do like me and listen to 17 $1 coins drop into the change area. I already showed that the Green Tortoise Hostel has private rooms for around $70/night. So, the cost of a night in Seattle for a meetup drops drastically with some hacking.
EDIT: Looks like parking at the Tukwila International Blvd parking area (600 spaces) is free. You are welcome.