Longbow

Longbow last sold for 10 gp (instant sell) and was last bought for 14 gp (instant buy) on the Grand Exchange.

You can buy 18,000 Longbow every 4 hours. The 4 hours start from your first purchase, and only buying counts towards the limit.

High alchemy turns Longbow into 48 gp. Buying one at 14 gp and casting with a nature rune at 137 gp costs 151 gp. That is a loss of 103 gp per cast at the latest prices, so it is not worth alching for profit right now.

It is not on the exempt list, but it pays no tax at its price. Selling one at 14 gp costs no tax. Items selling under 50 gp pay none, because 2% of the price rounds down to 0 gp.

The highest daily guide price on record for Longbow is 209 gp, on 28 Mar 2015. The lowest is 6 gp, on 5 Nov 2015.