You can always see what the discount is by going to apple.com, search for "education" then entering your school's information. Then the prices as listed will be discounted (if appropriate). For example, Macbooks are $999 instead of $1099, etc.
Apple did away with education discounts on iPods (aside from the back-to-school promos, which aren't good on the new iPods in the US) in September 2006.
amazon is selling it now and it is the same price as apple.com. at some point they usually drop the price a bit (~$20) but i'm not sure when that will happen. i'd guess it is months off if at all...
Are there any other discounts that I could get, like turning in an old ipod for 10% off. Can I use 2 different discounts, or is it one discount per purchase?