AFAI remember, I didn't have to pay extra to get 310% by getting 310% speed mounts. The only one I need to pay that 5k gold was for my pally alt and ironically, I got the drake the week after...

Anyway, back to topic, it'll be more economical to look for your realm's forum to get it. I know my guild is trying to do 2-3 runs at the moment on our off raiding nites, I can ask for you if you're serious about it. Although, you should have asked earlier coz I'm not sure how many people are there in the queue and we have not much time til Cata's launch.