I got this one free on Mar 1. I always check the receipts that Amazon sends via email (plus any gift card balance I have) to ensure I don't get charged. I must start being careful with B&N; I've never had a problem but I don't get receipts for free books so it would be easy to be charged and not know it till later.
On another note, I could've sworn I used to get receipts for free books from B&N before ...