Hey Biff, the two main ones were on the road out of C.Rai if you are headed to C.Saen. Just past the airport turnoff there is one on the left of the road, they have mostly doors and windows and a small selection of 'sao' posts and boards. A bit further out of C.Rai on the other side of the road is a much larger yard which has everything you would need, mostly in original condition, but they will clean/patch wood for you before delivery.
SiamRick sorry bout the photos, most are taken on a phone so not great quality.
Today's update is that the roof tiles are on, with a final bit of cosmetic work due tomorrow. Then Monday they start on the walls.