Maybe there is a way to do this, but I haven't found it. The ability to set prices that I want to automatically buy and sell at would free my efforts up to concentrate on other more important matters than clicking on the aluminum plus-sign everytime it goes below $30, or pressing the "auto-sell" button everytime water goes over $10. I know what I'm willing to pay and what I'm willing to sell at, but there is no way to tell the computer that other than to do it manually; this is time-consuming and seems like it could be automatic.