I’m regularly buying books for research and self-development purposes, often defaulting to Amazon.com as my site of choice. Since I’m constitutionally cheap, I will typically buy a used book if there’s a reasonable savings and the book is rated in good shape. I’ve yet to be burned by that approach.
If you buy in that same vein, I wanted to give you a heads-up about a site I’ve started using much more in recent months: Alibris. I’ve saved, on average, 30%-50% on used books from there compared to Amazon’s used prices.
Quality has been as advertised, timeliness good, and the buying process a breeze. If you haven’t tried them out yet, please do so the next time you’re in the market.