3D Artist Nicolai Becker has just released a great collection of wood textures with Oak boards (rustic and new), spruce boards, plywood sheets and walnut veneers.
Each texture was created using 150-300 high-resolution photos that were processed to create high-resolution scans.
They all include glossiness, normal and in some cases height maps.
You can download all textures for just $49 or try a high-res sample for free.
Check them all here.