Sap is a crafting component in The Witcher 3: Wild Hunt that is needed to craft resin.

It can be obtained by dismantling resin, found as random loot, or purchased from the following merchants:

• All armorers and blacksmiths
• Armors and weapons merchants in Nilfgaardian Army Group 'Center' Camp
• Merchant in the boatyard south of Refugees' Camp
• Merchant at Calveit Watchtower
• Merchant at Coast of Wrecks
• Merchant in Ursten
• Merchant by the road west of White Eagle Fort
• Merchant at the sawmill northeast of Rannvaig
• Merchant at the Isolated Hut on Hindarsfjall
• Merchant in Mohrin Village
• Merchant in Stacheier