Same is true of UDub. OOS cost with maximum Purple & Gold Scholarship is still close to 60K/year.
Utah is the affordable Boulder alternative. Strong STEM, strong honors college, phenomenal outdoor recreation as well as urban-adjacency. Colorado State is also a WUE school with strong STEM.
WWU could be an alternative to UDub, but WUE awards are competitive there. LAC’s with merit potential in the Pacific Northwest include Whitman (already mentioned), U of Puget Sound, Lewis & Clark, Willamette. (And the Catholic U’s - U of Portland, Seattle U, and Gonzaga - but it doesn’t sound like you want to consider those.)