Where are you located? I have no desire to toot my company's horn, but they do have a tendancy to sell used machines appalingly cheap. I don't know if we have any right now, but if you want more info, pm me. You could also look here or here, but I tend to thing these are horrifyingly overpriced. Also check Apple's special deals section in their online store.

I am the Doctor, and THIS... is my SPOON!