You might be able to find CTU at affiliatefuel.com
Otherwise get an account at search4clicks.com. They are a CPL network in the education vertical. You may want to call them after applying to expedite the app, their team works slowly otherwise.
I just checked and they have CTU coming in at $15 per lead.
I did well with them a while back when I was promoting education offers, they're credible, just not well-known.