Check the 'refurbished' section on store.apple.com - There you usually buy many of the previous generation model, thats where the 'stock' often ends up. You also might get good deals on previous generation on macmall.com or similar sides (but as this article points out, many 3rd party resellers are running low in stock - so there might not be many discounted 'old' models). I often buy machines in the refurbished section from apples site - nothing wrong with those and full warranty (but a couple of hunded dollars cheaper - also for current generation models)