After getting harrased during every purchase at Best Buy (it takes the joy out of looking when you get asked if you need help for every three minutes you take looking at the stock), and with Media Play and Towers Records closed, Amazon is the way I get 99% of all my media purchases these days.

I looked at my last purchase, and everything came in three shipments from three locations, bundles seeming at random. So I think they just keep different stock at different hubs.

The discounted price is great, as is the fact that I can usually get what I want.