This little tidbit was found on BestBuy.com

Prepare yourself for the ultimate Star Wars experience.

While supplies last, you can receive a free Best Buy exclusive Senitype collectible film cel from Star Wars: Episode III — Revenge of the Sith. Pre-order Star Wars: The Complete Saga now on Blu-ray, and on or around the release date, you'll also get the free cel.

So if you want a cell from ROTS head over to Bestbuy.com