June
For the month, that's 37 books, $40.39 in total, for $1.09 per book. Under budget and a very low per book cost. Two of the books were repurchases of books with bad formatting, so Amazon gave me a credit for the originals (Clutter Diet and Dune), which if purchased at full price would have bumped the total up to $52.37 and $1.42 per book. At least a couple of these are currently unavailable for purchase, due to the fallout from the 1984 book (Amazon has pulled all MobileReference books and is checking copyrights, it seems).
Here's the break-down by month, for the year-to-date:
Month | No. Books | Total Cost | Per Book |
January | 59 | $83.47 | $1.41 |
February | 43 | $29.97 | $0.70 |
March | 32 | $33.44 | $1.05 |
April | 22 | $13.11 | $0.60 |
May | 34 | $34.79 | $1.02 |
June | 37 | $40.39 | $1.09 |
Totals | 227 | $235.17 | $1.04 |