It's not just Penguin

Being a geek at heart (or at mind), I couldn't help playing around by checking ISBN numbers close to those of the deeply discounted books I posted about the other day. So I put one of the numbers into Google and started changing the last two digits. Imagine my surprise when a book popped up that was from another publisher, and happened to be written by a friend of mine. So the plot thickens. There are tons of deeply-discounted books listed for online sale, all with an ISBN number starrti...