My favorite store since I started building a Tiny House: The ReBuilding Center in Portland, OR.
I found the PERFECT bathroom door (a skinny 28 inches) from Douglas Fir (like the window trim and ridge beam) that was like new. Never painted, never finished. New, it would be worth $350 but I bought it for $60. And it’s GORGEOUS!!!!
Here it is finished with Linseed Oil: