I’m up C2 sapper and this skill ( Broom Trap) needs 3 ash woods to work, but the sapper master dont’ sell ash woods, he sell pine wood, WTF, what he dont sell ash wood too ?
Try buying them in the Dievdirbys mastet NPC.
Last beta, they were sold there.
Oh and enjoy your op aoe skill 
As Sagevoor said, the Diev masters sell them. You can find them in the West Siaulai Woods (Klaipeda area) or on the Woods of Linked Bridges (Orsha area).
… I think that’s the name of the orsha map at least. either way, both masters are pretty close to the Vakarine statues, should be easy to locate them.
