I inevitably find myself torn on what to do about this. Really what I want to do is contact the seller and explain in small words that what they're doing is illegal, as should be obvious by the words NOT FOR SALE emblazoned across the book's cover, but that I'm willing to overlook it so long as they provide me with a reciept stating they've donated the amount of money they sell the book for, including shipping and handling, to a charity, preferably of my choice.
What would you do in this position?
let it go because it's a hassle
let it go because it's flattering that people want the book enough to buy illegal copies
send arcaedia after them
contact them myself & tell them to take it down
contact them with the charity suggestion
i like to click boxes
other, suggested in comments