Some of those are also $0.95 CAD and $2.88 CAD
at Kobo, respectively, and should be couponable.
I can definitely recommend Wine of Violence which is very good, and conditionally recommend Artifacts, which is interesting and entertaining if you like past history/archaeology-related stuff.
And out of last month's PPP direct specials which are currently up on the site, I read the Fitzhugh Pest Control book, and it was very, very funny, enough that I went and bought the sequel during Books on Board's 40% off backlist sale which is incidentally still ongoing.
ETA: Lots of them just $3 during the sale, and DRM-free over at Books on Board. I sense a shopping spree ahead…