If you craft with the Mourning Dale fort under your faction control you can substitue one of the prismatic res. for the lower tier res. like asmo, runic, phoenix. Save coin
Another good tip for people crafting 2 perk items, check the New World Database for the item you’re crafting, for example Mythril Ring of the Scholar. In there, you can check the percent chance of a perk rolling and lock in the two that are of the lower percent. That way, you have a significantly higher chance of rolling the exact item you want.