Here are a couple more bargains from B&H. They should be couponable at Kobo, but it looks like the coupons codes have dried up for the moment. I'll link Christianbook instead, where these (and other B&H books) are DRM-free.
Christian Doctrine by Walter T. Conner is the latest $.99 deal from B&H Academics. It's from 1937, but it's still in print and used as a textbook in theology courses at conservative seminaries.
B&N Christianbook Amazon
The Apologetics Study Bible is $5.99.
B&N Christianbook Amazon