Are you asking for someone to let you borrow a server, or where to go to start renting one.
T:V servers really put a heavy load on CPU usage, so it is very expensive to host them, be prepared to pay a lot more than usual for T:V game servers as opposed to other games.
I'm not sure how many companies rent out T:V servers, but I will say that
www.branzone.com is a good one.
The owner plays Tribes and is a good guy, I used to rent a T2 server from him last year. His prices are very fair too so you may want to talk to him. He probably idles in #branzone still in IRC.