Can anyone link to a single book that has a listed price of $1? On the left-hand side, one can supposedly browse "$1 eBooks by subject", but all of them appear

Can anyone link to a single book that has a listed price of $1? On the left-hand side, one can supposedly browse "$1 eBooks by subject", but all of them appear to cost way more than $1. For the hell of it, I went to the "Mathematics and Statistics" section of these supposed $1 ebooks and added _Information-Theoretic Methods for Estimating of Complicated Probability Distributions_ to my shopping cart, thinking that maybe the discount isn't activated until items are in one's shopping cart. Nope! Not only is the ebook still $200 in my shopping cart, but there's no obvious way to remove the item from my shopping cart.