This week it is the book of James. Follow this link to Amazon. Don’t imagine that you are getting a $49.99 book free. That is the price of the Commentary on the New Testament. James is only about 17 2-column pages of that book.
I think this may be the last of the free books from Baker Academic at this time. Several publishers seem to be following this model in order to get readers attracted to their publications — always in hope that you will buy other volumes.