For some reason, Amazon has a 20gb Xbox 360 on sale for $329.99 right now.
Why is it $20 less than the recently announced official price drop? We have no idea, but it might have something do with Amazon wanting to clear out the current stock of non-HDMI models to make way for the new ones, though you shouldn't quote us on that..
Something else is a bit suspect: the item is named "Xbox 360 Console Includes 20GB Hard Drive". "Includes?" Does that mean that it is a core system with a hard drive thrown in? Are they just packing together older stock of stand alone hard drives with Core systems?
In the end, does it really matter? An Xbox 360 with a a 20gb hard drive is available now for $329.99. If you've been wanting an Xbox 360 and don't really care about HDMI, then why wait?