Originally Posted by DawnFalcon
If a book is PD in your country, then you are entitled to do whatever you like, including selling it. Yes, people can download it for free, but you can sell it if you wish. There is nothing legally wrong with this, unless you're actively advertising it in countries where it's not PD.
I'd suggest you get with the specific examples.
I keep forgetting this is an international site, I'm going by the ones that are either listed or displayed on Ebay UK.