If you are speaking about the TPE an HSI will cost about $ 50K, an OH about $100K. An used serviceable TPE-11 is about $ 150-200k.
If you get it from an good (mabe not cheap
) OH-shop you will have about 30°C EGT margin for your technicians to compensate for power loss over the time. This normally takes you easy to the next shop visit.