NL is illegal in WA. Tribal casinos can spread up to a $500 betting round, and they advertise these big spread-limit games as "no limit" (which they are not). Non-tribal casinos, by contrast, can only spread up to a $40 betting round (up until April of this year, it was only $25 -- so believe it or not, this is actually an improvement). All betting rounds are bet and three raises max, by law.
A couple of minicasinos (Parkers, Diamond Lil's) now spread some mid-limit games, but they are the exception. Usually you're looking at 3/6 to 9/18.
Best room for poker is Muckleshoot, hands down. I have a few minicasinos I'd also recommend, but it really depends on what you're looking for.
For a good listing, see
The Poker Atlas.
q/q