I've got books filling my shelves, day and night...

So I found out that there's three new Doctor Who books with the 12th Doctor that have been published.  Also, there is a book out about the War Doctor.  And so, of course, I had to get them.

Here are the yearly totals so far:

Jan 16: 5 books for $18.00; average $3.60 per book.
Jan 20: 4 books for $15.37; average $3.84 per book
     Total: 9 books for $33.37: average $3.71 per book.
Feb 2: 3 books for $29.92, average $9.97 per book.
     Total: 12 books for $63.29, average $5.27 per book.
Mar 9: 1 book for $9.65
     Total: 13 books for $72.94, average $5.61 per book.
Mar 30: 4 books for $51.56, average $12.89 per book
     Total: 17 books for $124.50, average $7.32 per book.
Apr 12: 7 books for $43.23, average $6.18 per book
     Total: 24 books for $167.73, average of $6.99 per book.
June 2: 1 book for $8.48
     Total: 25 books for $176.21, average of $7.05 per book.
July 6: 8 books for $86.68, average $10.84 per books
     Total: 33 books for $263.09, average of $7.97 per book.
July 6: 1 books for $20.44
     Total: 34 books for $283.53, average of $8.34 per book.
July 6: 3 books for $14.88, average of $4.98 per book
     Total: 37 books for $298.41, average of $8.07 per book
July 17: 2 books for $44.68, average of $22.34 per book
     Total: 39 books for $343.09, average of $8.80 per book
Aug 2: 3 books for $22.46, average of $7.49 per book
     Total: 42 books for $365.55, average of $8.70 per book
Aug 18: 4 books for $79.50, average of &19.88
     Total: 46 books for $445.05, average of $9.68 per book
Aug 31: 2 books for $27.26, average of $13.63 per book
    Total: 48 books for 472.31, average of $9.84 per book
Sep 24: 4 books for $42.36, average of $10.59 per book
    Total: 52 books for $514,67, average of $9.90 per book

POLT