Talk to billing.

Blast3r did, and in a fairly recent post I believe Blizzard offered her the ability to move two toons at once for the price of one paid character transfer.
The thread would be either in the Magtheridon or Kil'jaedin guild specific forums on this site (The Zerg or Legion of Boom), most likely started by her possibly just including her posts.

Half price is a huge discount on that many toons.
But it is still a hefty price tag.