...was a Sony PRS 500 eBook reader complete with cables, box, software etc. For £25. It's clean and looks virtually unused and seems to be working well so far, but I haven't tried putting books on it yet, since I need to go out again.
I know this is a fairly early model, but I think it will meet my eBook reader needs for now. And save me from lusting after anything else, at least until its limitations begin to annoy me.