Thanks Bob!
I'm going to keep an eye on that eBay one.
I did say in my original post that I was only interested in a used eInk one, because I'm sure that he would not at all be happy with an LCD device.
I was thinking about the 500, but they're still a little more than I know he'd prefer me to spend. I don't know a lot about the others, but I was thinking about something like an older version Cybook or a used eBookwise. I'm not sure price-wise, though, how much those would set me back. I guess I was hoping someone might have one in kind of less-than-perfect aesthetic shape that they'd be willing to part with.
As far as lending him mine for a week...it would be truly altruistic of me to do so...but he would have a hard time prying it from my hands for that long.
Seriously, though, he's played around with it....he just isn't that excited about it...I'm hoping that having one of his own might change that, though.