Tomorrow, the Gundemonium collection hits Steam, and that's about as un-mainstream as it's possible for a game to be without being exclusively on a few floppy disks in the houses of the designers' friends. And it's only ten dollars. And it's pretty much Touhou with an official outside-Japan release.
Eff yeah. And I know a lot of you guys like Touhou, or at least other Japanese games available on Steam (Recettear mostly) so give it a shot. Tomorrow. Or get it on PSN right now.
(At least, it's slated for November 27 for ten dollars for all of them.)
Edit: Sorry, I got the date wrong. Twice. Firstly, the game comes out September 27. Secondly, I'm in a different time zone, so the American 27th is my 28th...