I was vaguely aware that are are 'issues' with Amazon but am embarrassed to admit that I hadn't followed it up. Have now read Boycott Amazon – What is wrong with using Amazon? and will think at least twice in future before using Amazon!
Update January 2015:
The other day I came across Wordery on eBay while looking for the New Oxford Style Manual, following recommendations from translator colleagues. I proceeded to order the book from Wordery and was well impressed. Based on my experience so far, I can recommend Wordery as an alternative to Amazon for book orders.
Update July 2021:
Further recommendations from colleagues (not tried these myself yet):