"Black Ice," as well as all their old albums, is on Sony/Columbia in the US. Apparently AC/DC owns their masters, and are no longer on Atlantic. So it's not an indie...it's just that WalMart committed to buying 3 million copies in return for the exclusive rights to sell it in the US.
And BTW, it is FANTASTIC! It's by far the most consistently good album they've done since "Back In Black." I downloaded a leaked advance copy of it, and I can't stop listening to it. I will be going to WalMart later tonight to buy it for real. If you like AC/DC, you will love it. "Big Jack," "War Machine," "Stormy May Day," and "Spolin' For A Fight" are probably my favorite songs other than "Rock And Roll Train." Hard to believe they're all in their 50's except Brian, who's 61. It sounds like it could have been made in 1976, except of course for Bon Scott not being in the band now.