San Francisco Wine Trading Company currently has the 1997 Osborne Vintage port available for $15.92 when purchased in a 6-pack ($19.95/btl in qty less than 6). Normally a $45-$50 btl of port.
Note, this does not seem to appear on the web site, but it's still available if you call. I just spoke with them and they have a lot left.
1-800-681-Wine