I have some cash in my account that I want to put into something that will give me some interest while I wait to make stock purchases. What can I buy that will be as safe as a CD but will allow me to pull my money out right away if I want to purchase a stock? It's only a small portion of my portfolio, so it doesn't matter to me if I don't get much interest on it, I just don't want to leave it all as cash and get next to no interest on it. Thanks for any help you can offer.