In the NW there are basically three dealers that keep any sort of inventory on hand.
Current Inventory/Pre-Owned Inventory from Harlow's Bus Sales
In the NW, Harlow's has a dealer facility in Auburn, Spokane, and Whitehall, MT.
Bus Search | Western Bus Sales
They have an extensive facility in Boring, OR.
Complete Inventory of Buses for Sale | Northwest Bus Sales
They have a large facility in Federal Way and Las Vegas.
There are three other bus dealers that work in WA and OR. They sometimes have a few used buses in stock.
Bryson Sales and Service - Authorized Blue Bird Dealer
Bryson has a facility in Everett.
Schetky Northwest Bus Sales | NW Bus Sales | Bus Sales Portland Oregon
Schetky has a facility in Portland, Tacoma, and Pasco.
New & Used Buses for Sale | Creative Bus Sales
Creative has a facility in Mukilteo and Canby.
You should be able to go to one or more of those facilities to kick some tires and get an idea of what might or might not work for you.
Good luck and happy trails to you!