The Financial office is probably pretty busy this time of the year, I wouldn't worry unless they take longer than the month it took me to hear from them.
I bought 14 books for 750~$ and I got the majority of them through amazon's used section and made sure they came with the CD if they were suppose to have one. But in all honesty I probably wont use the CDs unless they are required. I really doubt I could do better price wise than that. (12 that are required, 1 winter and 1 drug book). In terms of access codes I'm pretty certain if you really really need them you can go to the publishers site and buy it.
If you buy that package deal its 7 books for 620ish dollars. So I think used books are the better way to go. I imagine when I have them all stacked up it'll hit me how much stuff we have to learn in a semester.
Oh yeah, and I did notice that the booklist they gave out isn't necessarily correct in all of its info. Even though edition, author ispn, and title is correct. It might say 2010 on the booklist and be 2009 on amazon. Also the ISPN #s are written a little different in terms of where they place the dashes, so I would play around with the names/authors of the books.
I wanted to buy the books asap because I know the closer it gets to the start of the semester, the used sections is not as cheap and has less options.