well theres another item that gets you REALLY NICE PROFIT if you get to sell it.. buy beetle bits from pet shop, 10 gp each (buy x option), then sell for 120gp each !!!!! ;)
Are you all idiots? Do you read RS updates? Jagex spiked the prices due to a change in granite which is used for a summoning second. They also changed the price of potions due to the fact they added a "Decant" option to the herblore guy at G.E..