If you belong to one of the record clubs (BMG or Columbia House), you
can buy this title, and similar mainstream big hits, just about any time
for a less (that is the true price, after S&H), sometimes a lot less.
For new titles, obscure titles, and titles that don't ever appear in the clubs,
then it's worth looking at the retail stores. But for stuff like Back in Black
(remastered) you best bet, day in and day out, is the record clubs.
Kwad