Put areas around Longview and Ridgefield Washington on your look-at list. No sales tax in Washington. Property and home values vary. Keep in mind the fact that the wood products industry has shed jobs like crazy so the Longview area may offer better values (a lumber town). One advantage of both is that they have access to excellent medical facilities (Kaiser serves both and there are major hospitals in Portland, including a VA hospital). Not far off I-5, PDX is about 45 minutes drive away.
Where ever you land look for a home with a septic tank, be sure to have the well tested.