Barnes & Noble's website (www.bn.com
) can also be a good option - especially if you become a member and get their 10% discount. It does cost $25 to become a member, but since casebooks and supplements will cost you more than $300-$500/semester, you will save $30-$50/semester, $60-$100/academic year. www.bn.com
has most supplements (outlines and hornbooks) and casebooks, so it can be a good option.
Other than that, I agree with the others who have said Amazon.