Elemental sphere (flatpack)

High alchemy turns Elemental sphere (flatpack) into 6 gp. Buying one at 906 gp (its guide price, as it has not traded today) and casting with a nature rune at 138 gp costs 1,044 gp. That is a loss of 1,038 gp per cast at its guide price, so it is not worth alching for profit right now.