I don't think that there are any general codes out, but if you are going real late in the month, you may be able to book Fall Fantasy and save some money.
This site also lists the current discounts. There is a link at the top of the message boards.
Check out mousesavers or the official Disney site. Mary just posted today that the web site now has great deals for 8/25 to October some time. I don't know when you were planning to go in August but I though it was worth a try.