A number of the
87th Precinct Mysteries by Ed McBain are on sale for $0.99 at Amazon US. The series # and titles are:
1.
Cop Hater
2.
The Mugger
3.
The Pusher
4.
The Con Man
5.
Killer's Choice
6.
Killer's Payoff
9.
'Til Death
10.
King's Ransom
16.
Like Love
They can all be found at
https://www.amazon.com/dp/B085XWDG5Y