No i dont think you missed out, pretty sure it didnt happen.
I ceratinly didnt find it and im in the industry that would look.
Oh and get a ps3 instead, ive got both and wondered why i wasted so much time with xbox, not to mention the rings of death twice and constant freezing, oh and the noise!
I can assure you it happened. My mate picked up one at that price. It was the "Gift Giving Frenzy" promotion, most stuff was 20-40% off in store.
Constant freezing? I've never had an xbox freeze on me, and I've had it for 6 years. Best advice you can probably get in selecting consoles is
a. Decide which controller you feel more comfortable with
b. Decide whether you like alot of online or not
c. Decide what exclusives interest you
The reliability between the consoles now is virtually identical.