Handmade ambrosia might sell less than Fortify Mana Regen potions, but buying Thistle & Peaceweed and crafting ambrosia still gives you net gain. You may have found Thistle on Riverville’s potion merchant, but Peaceweed can be found on merchant next to Ark’s marketplace leatherworks shop: So far I’ve found an easy & cheap Ambrosia recipe, consisting of Thistle and Peaceweed.