Well it's no money, but besides a bit of gold for trout or some other low healing food, it doesnt cost much either
I'm talking about experiments, and for pures its the best melee xp your going to find tbh. No loots, not much food needed though and the autofighter should be able to bank in canifus fine, it did for me and it didn't stop til runescape updated or I stopped it so I'd do that.
or rock crabs I guess but there crowded.