Three things come to mind. 1. Spokane is North East Washington, The area around Moses Lake might be better. 2. Lewiston is Northern Idaho, cold winters and lots of snow. Boise valley might be better. 3. Oregon has no sales tax. If you shop in Washington with a Oregon DL you pay no tax, but you do if you shop in Idaho. What kind of fishing you do should also make a differance.
Congratulations on the retirement.