I doubt anything anymore; you wouldnt even break even. People used to do it for the sake of castign that spell. You could mine all the coal and buy iron to make steel plates. This way you dont lose any money when you alch them. You could also buy rune meds for 10k and high alch them for a small profit. But, other than that, hich alching f2p isn't a very good way to obtain magic experience.