[Plugin Updates - June 2, 2020]

still no thatpacketaddon fork, f

[Right click to sell.]

on script load:
	set {prices::iron ingot} to 10
	set {prices::gold ingot} to 15
	# etc

on right click: # all the information you gave, edit to your liking to fit your actual needs
	loop {prices::*}:
		set {_item} to loop-index parsed as item
		set {_amount} to amount of {_item} in player's inventory
		set {_reward} to {_amount} * loop-value
		send formatted "You sold %{_amount}%x %{_item}% for %{_reward}%" to player
		add {_reward} to player's balance
		remove {_amount} of {_item} from player
		delete {_item}, {_amount} and {_reward}

something like this should work, untested

[Skript Baltop]

There really is not a good way of sorting in vanilla skript, even the way above will crash your server if your list variable has a large amount of values, I don't know why the developers haven't bothered to add a sorting expression yet because forcing skripters to do it themselves (on minehut without skript-mirror) is an awful idea due to how greatly skript loops impact performance.