You can find an amazing sport horse on CanterUSA.Org
If you do your due diligence, you can find a trainer that wants a solid, sound, willing TB to just get a good home. Sometimes they will give them to you, I have also seen them go for $500. The hunter champion in the state I ride in came through CanterUSA.org for $600 and he is a flashy boy winning all his classes.
Check it out!
Canter does have some really cute horses with a ton of potential! But remember that they're 5-600 at the moment. I guarantee that hunter champion you're talking about is worth a lot more then that now. A made horse is worth a LOT more then something off the track. Esp one that has the show miles. Tack on more if the show miles are extensive and successful. An off the track horse is NOT for everyone. If you are not able to put the proper training/rehab into an OTTB you'll need to pay to have someone else do it, and often for the same price you might as well get a made horse.