Fiery Weapon EnchantFollow

You can make money off the enchant if you are capable of soloing the Cathedral wing of Scarlet Monastery. You are guaranteed two blue items from the end bosses, which disenchant into small radiant shards. Fiery takes 4 small radiants, which is two Cathedral runs and one Essence of Fire, which are usually dirt cheap (meaning less than a gold).
You can also make money off the recipe if you are a rogue (iffy though) or druid (ideal for farming the recipe) by running black rock depths and using your stealth to bypass a lot of the trash. It is POSSIBLE to bypass the trash as a mage (invisibility), priest (fade) or gnomish engineer (world enlarger), but it is far easier to bypass the trash as a class with stealth. I have only farmed the recipe for myself with a buddy who was capable of soloing BRD so I can't tell you any tricks or even where the hell to find the guy who drops the recipe anymore.