I was recently at www.amazon.com searching in the Movies&TV department for The Twilight Saga: Eclipse DVDs and Blu-rays, when I noticed this:

http://www.amazon.com/gp/search/ref=sr_pg_2?rh=n%3A130%2Ck%3AThe+Twilight+Saga%3A+Eclipse&page=2&keywords=The+Twilight+Saga%3A+Eclipse&ie=UTF8&qid=1286949399#

If you want to be notified when Breaking Dawn Part 1 and Breaking Dawn Part 2 are available for pre-orderability sign up.

I was surprised.