Open Road Media has a set of mysteries on sale for July. These are $1.99 and many are the first in their series. Several have been on sale before, but I found a couple I hadn't seen on sale before.
Here's the list:
Powder Burn by Carl Hiaasen and Bill Montalbano
The Pot Thief Who Studied Pythagoras by J. Michael Orenduff
McNally’s Secret by Lawrence Sanders
Fellowship of Fear by Aaron Elkins
The Square of Revenge by Pieter Aspe
Drowned Hopes by Donald Westlake
Death-Watch by John Dickson Carr
Strike Three You’re Dead by R. D. Rosen
The Grub-and-Stakers House a Haunt by Charlotte MacLeod
Duffy by Dan Kavanagh
Smoked Out by Warren Murphy
Drawing Dead by Pete Hautman
And a link for Amazon US:
http://www.amazon.com/b/ref=amb_link...d_i=B00IJN047E
[Edit: Also available at Kobo US and couponable. PERKOPOLIS still worked for me.]