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Amazon US (where I usually buy my discs). It went on sale for like $23 so I had to pick it up.
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https://www.amazon.com/Watchmen-Collectors-Ultimate-Graphic-Blu-ray/dp/B0093ICOE0. Here ya go!
Else I would get this to get the whole package - https://www.amazon.com/Watchmen-Collectors-Ultimate-Graphic-Blu-ray/dp/B0093ICOE0/ref=sr_1_2?ie=UTF8&qid=1486397281&sr=8-2&keywords=watchmen+blu+ray
Why not both?