I'd be willing to offer space on my server (for free). I'm running win 2000 adv. server and I have about 30 gig of free space. Also I'm sure there are a few others out there that would be willing to contribute some space.
A few ideas I have about this.
1. You could move the whole site so there are no costs involved.
2. Just move the archives to other servers. That way if there are any problems (with compatability or other server issues) it wont affect the main part of the board. And you could divide up the archives and just place links to the servers where the info is stored.
3. Deleteing the archives. But then there probably would be a lot of the same questions every month or so, since the archivee post would be gone.

my $0.02