I've heard that if yoiu call phone support, they will generate a v9 serial for you in this situation, but I've never had to do it myself, so it's hearsay at best.
You may also be able to return the serial to the vendor, and get on on EBay or one of the other Auciton or Surplus sites.
(I recently got a v9.0 base serial for $90.00 on EBAY for our church)