re: textbooks. Maybe this is too late but w/e you can do this for the later classes.
I rented all of my books, but it was split pretty evenly between the school bookstore (they only rented new 1L books and you can highlight in them) and amazon. I would rent the ones from the bookstore, which you could return within 2 weeks, and then order them on amazon. Sometimes, the amazon ones will be new, and in that case, I would return the bookstore one (I'd just scan stuff until the amazon one came so I could write in it) and keep the amazon one. If not, I'd send the amazon one back. Had I been more on top of it, I could have ordered the amazon ones first, andthen only rented if they weren't new.
(LC39, fyi, if you aren't, you should be renting all of your books. If you bought them, just go back to the bookstore and tell them you would like to switch to renting.)