I tried to purchase some books I found on amazon. Unfortunately, it looks like buyign used isn't quite the deal it appears to be.
my order with predominantly used books was 36.60 w/ 42.38$ shipping for a total of 79.66 w/ a little tax.
But, I guess I do save some money afterall. As a rule of thumb, Free super saver shipping makes a difference on books available used for 50% or less than amazon's regular price, but not on items which are pushing towards amazon's price.
if that book is 99 cents used and 8.99 new, get it used, but if you are only saving a few dollars get it used and save on shipping.