The massive and ongoing sales success of the Fifty Shades of Grey trilogy is pretty remarkable (over 20,000 copies this week), made more so
by two factors, the first that supply has clearly been a major issue, several bookshops tweeted or Facebooked pictures of fresh stock arriving into their office or reported that the stock they had recieved was already sold out again, the second that sales as reported through Nielsen do not include firm sales for many
independents (these are
instead «estimated» but for a freak title like this, I'd wager any estimation is on the low side, especially because the sales for the trilogy seem to have been happening across the
board).