This site has by far the best deals on Reds tickets I have found. I just picked up 3 tickets behind the opposing dugout (3rd row) for $25 each. They retail for almost 90 bucks each.
Basically you pick a game, and based on projected attendance (I'm guessing), they let you know how good of a deal you can get, and then you name your own price. You can keep lowering your offer as long as the site finds tickets at the price you enter.
I started off at $40, and got it down to $25.
I don't work for this site or anything, just thought some Redzoners might want to save some money this summer.