Hey mate,
a guild on my server is doing just that. Dentarg EU, i googled the link to the boost page for you
http://www.badomen.info/website/inde...crown-boosting
"We are selling the meta achievment in Icecrown Citadel (10 Player) which rewards a Bloodbathed Frostbrood Vanquisher. Additionally we are also selling [Bane of the Fallen King], or both as a package deal with a 10,000g discount. Loot is included."
"We are now also selling the title [The Light of Dawn]*. This will include no loot and only the encounter required to get the title."
I'm not in that guild so if you have any more questions about it you'll have to contact them yourself matey. I think what they are selling is a bit more than you need but contact them anyway as you may be able to get just a kingslayer title for less.
Have fun