Luden's echo TTL shopping

In the TTL map the item Needlessly Large Rod its not present, that mean you must buy the new item Luden's Echo directly full, you cant buy it in peaces. The recipe is: Needlessly Large Rod + Aether Wisp + 650 gold (total cost: 3100 gold). The Needlessly Large Rod can't be bought so you have to eather buy the Aether Wist first and then Luden's Echo or directly Luden's Echo.