Dean Wesley Smith has a great article on selling short fiction and all the different markets you can approach, including traditional and indie. He makes a good point, which is that the marketing value of getting a story published in a magazine makes it worth sending stuff there, even if the chances of making a sale are very low. I also think he has a point that you're probably better off bundling two stories and selling them for $2.99 than publishing them separately for 99 cents--it's making $2 one way versus making 70 cents the other, and that's going to add up. (Yes, you might lose impulse sales, but I think with the math being what it is, it's worth trying....)