Does Barnes and Noble ship each book separately? I've now gotten 5 different emails for an order of 6 books, one which included 2 of them together. Seems like a waste of shipping packaging if that's the case.
I just ordered from them a week before Flash vol 2 came out. They held my whole order until they could ship Flash, so I think the default is to ship as few pieces as possible. I used free at $25 shipping. Maybe you paid for shipping or have a membership? I would double check they didn't hit you with extra shipping charges if neither of the above are true.
the Millar/Quitely Authority comics are actually my favourite Authority stuff and easily in my top 3 Mark Millar things (that said even as a fan some of the uncensored pages strike me as a bit too much and one of the scenes in particular is incredibly racist and misogynistic in a very cruel and unpleasant way)