- At the very start of the game, you can get Scrolls of Wisdom by picking up normal rarity (white) items and selling them to an NPC. That way you will get Scroll Fragments, 5 of which make a Scroll of Wisdom.
- If you have many Portal Scrolls but are low on Scrolls of Wisdom, you can get Scrolls of Wisdom by selling Portal Scrolls to a vendor.
- Sell Armourer's Scraps, Blacksmith's Whetstones and Orbs of Transmutation to an NPC. These are very common, so no worry about selling them, and you can get 2 or 4 Scrolls of Wisdom by selling one of those.
- Some experienced players have Scrolls of Wisdom hidden in their item filter, and pick up some of the currencies mentioned in the previous point. That way your screen is not cluttered with lots of scrolls and you save time - you get four scrolls by picking up one item.
Path of Exile