Zondervan has just released the volumes of their
Illustrated Bible Backgrounds Commentary, Old Testament as ebooks. To mark the occasion, they are having a sale on all of the ebook volumes.
The price of each, through Sunday, February 27, is
$4.99. I was able to access a partial list of what the Amazon digital (Kindle mobi) prices will be for these after the sale is over--those prices range from $9.99 to $19.99 each.
With these books having been available in physical form for some time already, there are some ratings and reviews around based upon the books in that format. Those ratings are generally excellent. Check
Amazon and/or
GoodReads (there are more ratings, and especially reviews, at Amazon than at GoodReads) for them.
Here is
the sale webpage at Zondervan Academic, where you can get additional information.