When I was f2p (which is around half a year ago), I did lobsters (cookced), yew logs, nats, chaos and rune ess. Chaos runes i bought in port sarim rune store and sold in world 1 for 135-140 each. You can do the same thing with death runes, sell for 300. Chaos will be 112 or so, death is ~230. Fairly profitable, buy 1k chaos and sell them. When you get more money, buy death aswell. Don't buy them if you can't afford to buy 1k of them. Iron could work, and so could coal..
I think ess was easier earlier when it was 20-40, not it's more like 30-40. Harder to make a good profit, but yea, you can still earn money here aswell. Merchanting rune scimmys isn't something to get rich on imo, just not enough buyers, I'd rather just fish or chop wood or something. WIllow logs can be bought for ~25ish and sold for maybe 40 on rs forums. You might wanna check this out before you actually buy willow logs.
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