- You can sell an armour piece (Body Armour, Helm, Shield etc) with 20% quality to an NPC to get 1 Armourer's Scrap. You can also sell several items with total quality of at least 40% to get one. This is likely never worth it though, as Armourer's Scraps are basically worthless.
- You can buy 1 Armourer's Scraps from an NPC for 1 Blacksmith's Whetstone. Note that whetstones are actually a bit more valuable.
- By the end game these will be so common loot drops, that you will find more than you will ever need
Path of Exile