The guide price consists of a small window in which an item from the inventory can be added or removed, while actively displaying the total and individual current Grand Exchange market price of each item(s). The prices of up to 28 different items can be checked in this interface. If a player clicks an untradeable item or attempts to price check a members item on a free to play world, text then appears, stating: "You cannot trade that item".
If the value of items displayed in the Guide Price window exceeds 231-1 (2,147,483,647) coins, the total guide price is listed as '----'. This occurs because Old School RuneScape computes values using 32-bit two's complement integers, and therefore cannot output values exceeding 231-1.
At the bottom of the interface, the total value of all of the items is shown at the bottom on the centre. At the bottom-left, players can find prices of any item from the Grand Exchange to find their current price without the need of going to the Grand Exchange.
When dealing with price guides from the Grand Exchange one should always keep in mind that just because the Grand Exchange states a price that doesn't automatically mean it is even an average price the item is selling for. When selling valuable items in bulk you should always attempt to buy one at the exchange price; if you're not successful, raise your offer. What you pay for a single item will give a more true picture of a reasonable asking price. Example: The Exchange states a bucket of ultracompost sells for 674. When you try to buy one at that price you find you must spend 850 to get one. Now you know your 1000 buckets of ultra are worth 850 each, not 674.