Rob makes a point about price on "free domain material" not costing Logos anything, but it does cost Logos time and effort to setup all the links that make searching books doable. There are LOADs of free use books online in PDF and HTML text, BUT, being able to search them in Logos makes message preparation so much easier. Jammison Facuet, and Brown is an OLD commentary, but it is a golden oldie! Its free to use online, but I like the ability to search for content while doing all my other research inside of Logos! Long story short, I've been using Logos since around 1992. I used to have a table full of books open while researching for a message. I spent hours doing research. Now I spend MUCH less time on research and have MUCH more time for reflection on the research!