The MacArthur Bible Commentary and the NKJV edition of
The MacArthur Study Bible are both on sale for $6.99. The commentary is just the study notes and material from the study Bible without the Bible. In ebook, I find the commentary easier to use than the study Bible.
They're eligible for coupon codes at Kobo and there's a
contest right now, so US, UK and Canadian customers can get another discount on top of the sale price.
Commentary:
B&N Kobo Amazon
Study Bible:
B&N Kobo Amazon