There are three Mickey Spillane/Mike Hammer collections available, but they are Penguin and not couponable in the US, at least. I had bought these way back from Fictionwise, when they were couponable, so I haven't gone looking for a Kobo site where they might be couponable now, but maybe someone else can do that if interested.
The US link is:
http://store.kobobooks.com/en-US/Sea...n&fcmedia=Book