Bundle of Lumber

This was a drop item that gave the lumber resource to the player in Warcraft III: The Frozen Throne.

Source
Tyrande and Maiev can find one worth in Shards of the Alliance, chapter 6 of the Frozen Throne sentinels campaign, Terror of the Tides.

Kael can find two worth in Misconceptions, chapter 1 of the alliance campaign, Curse of the Blood Elves.