Buying and selling second-hand books?

Econometrics textbooks can be quite expensive so it is often worth looking out for a second-hand (used) copy instead of buying a new one. In many universities students will do this through their local bookshop, or via messages pinned to noticeboards. For a wider reach you might try eBay. Another place that you might try is iSwapBooks which was set up last year by a couple of Durham University graduates. This might be a good place to go too if you want to sell some of your textbooks for courses you have now completed.