I have a mixed relationship with selling books on eBay. I used to regularly sell my Organizing a Murder ebook of party games that way, selling at least a copy a week, which worked wonderfully well as there was nothing to post (and I got really happy feedback). Eventually eBay stopped me from selling it because they said I didn't have the rights to do so. Despite many attempts to point out that, as the author, I had every right, I never got anywhere - any attempt to get an non-robotic response out of the supposedly human customer service team at eBay is a nightmare. I think they have now banned selling e-products.
I've never really bothered selling physical books this way, but I thought as an experiment I would try selling a signed copy of Dice World with a personalised dedication. It's on this week - you can take a look here - and at the time of writing it could be yours for £1.04 (UK only, I'm afraid). I've no idea what will come of it, but I think in the writing business you have to be constantly experimenting with different ways of being in contact with the audience, and I hope this will be an effective one. We shall see! I will update the post with the outcome after the event.