http://btb2.free.fr/files/morrowind_economy.zip
For the record, yes, the mod is meant to edit every NPC who offers services of any kind, including training. In fact, it has a special version of its script that is used to boost the mercantile & speechcraft skills of trainers without interfering with their trained skills. The Blades Trainers are of particular importance to this mod, given how early in the game they appear and how high their initial disposition toward you should be.
I'll update my mod list sometime next week along with the GDR fix I posted the other day.
-BTB out