Amazon is awesome. I have purchased hundreds of DVDs, HDDVDs (back in the day
and Blu-rays from them. If you buy a lot, get Amazon Prime. $79 bucks and all two-day shipping is free for the next year. Save me hundreds of dollars every year.
They're also easy to return stuff to. If a movie is bad, they ship you out a new one same day and then when you get it, you can ship back the bad movie in the same box at no cost to you.
Generally, their pricing on Blu is better than anyone (and WAY better than retailers like Best Buy). Go Amazon and my crazy buying habits