Oh good, you got a spot on a table then. I'll be there this year too, not selling anything of course, the lack of artistic talent kind of puts an dampener on that. I'll get pins and buttons like I always do, plus if you end up selling them the FF doujinshi and the Okami mirror I'll grab one of each. Prints, it would depend on on the prints I guess. I don't tend to buy many though. I don't usually buy bookmarks either.
Voted Pocket Mirrors (You'd never see anyone else with those at Manifest I bet), but I'd love to see pins (your Katamari ones especially, there's not enough variety in Manifest pins normally so anything different catches my eye) and some prints as well. I dunno, indecisive! If you open a pre-order thing at any point I'll chuck in some specific requests print-wise. :3
I saw you had an account on the Manifest forum; it's actually a really active forum (con forums usually aren't I find) so maybe make a thread there with examples if you want a better idea of demand. You can do polls on those forums too. Cx