I have another question, haha.

I was looking at drewbooks.com, and it doesn't seem like any of the textbooks that are being sold are the correct editions I need, according to the bookstore. Is there really a big difference between 1 or 2 editions of the same textbook? In other words, would it matter if I bought the 6th or 7th edition ('cause it was cheaper) when I was supposed to get the 8th?

Also, is the bookstore correct in listing only one book for Intro to Psychology?