I voted for the 201-1000 option. I too read mostly histories and typically pay more for new releases than I probably should. I estimate that I'm paying about $15 on average for newer released histories written by scholars. However, I have hundreds of freebies that are histories written by authors before Gutenburg even invented the printing press! I've no clue what my average book cost is, taking in account the freebies and cheaper, older books that still cost something, but I will guess around the $2 to $5 range.