We have everything available here, from camping in a tent and cooking over a fire to Bed-n-Breakfast places to big chain hotels. The 'official' lodging will be the Embassy Suites. It is central to all the events, has reasonable rates, and free breakfast. And it's not that namby pamby 'Continental' crap that the Canadians tried to sell us, either.
15920 West Valley Highway
Seattle, WA 98188
Tel: 1-425-227-8844
We have 25 rooms reserved for us at a cost of $109/night (normally $169/night). The group code if you call is "Supra Nationals" or if you go online it's "SUN". The Embassy Suites offers security for the vehicles, convenient location to SeaTac International Airport, along with various other amenities.
Embassy Suites Seattle

No, this isn't an actual picture of the hotel, it's not really underwater... yet. Give Global Warming another few decades to work, dammit.
If you plan to stay here, I'd suggest calling to book a room early, as we tend to max out any available rooms quickly. A few years back I spent nearly two hours early Saturday morning trying to find a place to sleep that wasn't in my car in the local Walmart parking lot because I figured it would be easy to grab a room on the day of the event. And I ended up in one of the sleaziest hotels I've ever had the misfortune to witness. Cockroaches would have been an upgrade, even they had moved on in disqust. Note to self: don't try that again!