Create a GE like format where players could list the numbers of items for sale and the price they wish to receive for each item. IE 1K Mind Runes 10ea (have an option to buy in bulk or freely).
Then have an option to scroll around and look at prices. Either have a local option of all of OSRS option. The same goes for buying. Put up what you want to buy and how much you are willing to pay. If someone sees that options they can sell you the item.
The scroll option allows for you to see multiple options for that item and you get to decide if you want to buy it.
To make things a little more fair, you could make it so the item has to be in the stock, like in the GE and a new feature, you must be online to buy or sell an item. This will add a little change to things and will help prevent drastic changes in prices to a certain extent.
08-Jan-2014 05:37:40