[link|http://linuxtracker.org/torrents-search.php?search=OpenBSD|http://linuxtracker....hp?search=OpenBSD]
Also, try here:
[link|http://openbsd.sabotage.org/|http://openbsd.sabotage.org/]
there's a pertinent bit of info on that page:
The OpenBSD team does not offer a downloadable ISO CD-ROM image of the operating system. However, they do allow third parties to create and ISO image and offer it, but it must have a different layout than the "official one".