None have ever come up on Ebay, I have it set to send me Battletech Rifleman updates. However I live close enough to attend several conventions this year but with the wife, kids and work it doesn't always work out.
I hate to be the one to break it to you then, but eBay lied to you! :D I saw them start popping up after Origins last year, if not actually
DURING. :o I also saw them show up on eBay after Gen Con. I only mentioned those 2 because I know they're "The Biggies", and didn't know what other Cons IWM attended, by the way. But as for eBay, I'll agree that there haven't been any there for a few weeks at least, if not a month or so.
NOT that I'm supporting eBay over IWM! I'm just pointing it out as an option. There's just some things you
HAVE to get there, like it or not. #P