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

Today, after work, I went to eat at a Mexican restaurant with a coworker after work.  When were finished and parted, I went to Ollies, where I, surprise, surprise, bought some books.  Then I went to Sam's and bought, among other things, some books.

The titles:

The Wit And Wisdom Of Star Trek, by Robb Perlman
Knockemstiff, by Donald Ray Pollack
Hellboy The Companion, by Dark Horse books
The Avengers' Encyclopdia, by DK

The Dark Tower, by Stephen King
The Trials Of Apollo Book II, by Rick Riordan

These are the yearly totals:

Jan 21: 2 books for $5.26, average of $2.63 per book
Jan 26: 2 books for $21.14, average of $10.57 per book
     Total: 4 books for $26.40, average of $6.60 per book
Feb 20: 2 books for $14.57, average of $7.29 per book
     Total: 6 books for $40.97, average of $6.83 per book
Feb 25: 5 books for $18.22, average of $3.64 per book
     Total: 11 books for $59.19, average of $5.38 per book
Mar 11: 3 books for $11.83, average of $3.94 per book
     Total: 14 books for $71.02, average of $5.07 per book
Mar 22: 3 books for $15.12, average of $5.04 per book
     Total: 17 books for $86.14, average of $5.07 per book
Apr 11: 2 bucks for $33.37, average of $16.94 per book
     Total: 19 books for $119.51, average of $6.29 per book
Apr 28: 6 books for $37.74, average of $6.29 per book
     Total: 25 books for $157.25, average of $6.29 per book
May 12: 1 book for $8.84
     Total: 26 books for $166.09, average of $$6.39 per book
May 14: 4 books for 13.74, average of $3.44
     Total: 30 books for 179.83, average of $5.99 per book
July 15: 4 books for $22.66, average of $5.67 per book
     Total: 34 books for $202.49, average of $5.96 per book
July 16: 6 books for $86.72, average of $14.45 per book
     Total: 40 books for $289.21, average of $7.23 per book
Aug 5: 2 books for $27.41, average of $13.71 per book
     Total 42 books for $316.62, average of $7.54 per book
Aug 18: 4 books for $17.96, average of $4.49 each
     Total: 46 books for $334.78, average of $7.28 per book
Aug 18 (also): 2 books for $20.27, average of $10.14
     Total: 48 books for $335.05, average of $7.40 per book

POLT