If a stock is currently selling at say $30. And I want to purchase x amount of shares if the price reaches $28 what kind of order do I put in? I put a stop of 28 with a limit of 28.5 but cancelled it because I wasn't sure that was right. I thought it was a stop limit but I think that is not correct because it says stop limits are usually above the market price. I am using tradeking if that makes a difference. Thanks for your help.