OP here: for clarification, these are the books for one course. The rest of my books for my first semester (I'm a college freshman) drove my textbook costs up to over $500. So having to pay nearly $200 more for my books that did not come as advertised is a bit of a shock, to say the least. For reference, I bought all of my books the week before move-in, and I've only just finished my first week of classes. Luckily, my professor is very understanding, and she just sent me the link to where I could buy the codes and know they were legitimate, and she said she'd just give me credit for what I've already missed. So, I guess you could say this story has a happy ending, more or less. I'll just be better about it when buying books for next semester.