I have books for the Physics 21 series, Chemistry Series, Human Biology Core, Psych 1, etc. These are the books that will take you all the way through Stanford Premed. The editions change every year but the information is exactly the same. The average price is $120 each in the bookstore so if you want to get a great discount and have your books before the year even starts then this is the deal for you. Each one is going for 50 and they are in perfect condition with no marks at all.