i wanted to sell some of my textbooks from past couple of semesters. at my college they didnt really have any buy back value, so i thought i'd sell them on amazon. i set the price to be as low as the lowest price on the web site. when someone buys your stuff, Amazon issues 3.99 shipping credit, but then when the payment clears, they take about 4+ dollars, so it comes out of the sale price. and then to ship it is actually more expensive then 3.99, like one of my books actually shipped for 13, and i sold it for 17, and then amazon takes 4. so i pretty much gave it away. i should have thought of it and found out what the shipping expenses would be before i started... sigh... does anyone one know of any ways to ship stuff for cheaper? or maybe other tips for selling stuff online?