Yeah, my search didn't respond to specificity either. Had to stumble upon it... Not sure why this one is more open ended than the first one I found. And 'advance' tells us nothing about sales revenue. Cotton received more than $500,000 in advance for the book, according to a source close to him. https://www.politico.com/story/2019/02/04/tom-cotton-arlington-book-1144756