The main factors influencing the total cost of FES installation, are:
single / double seater sailplane,
used as a pure sailplane / used, but prepared for FES installation in advance,
possible specific features of each sailplane type,
possible special local regulations and conditions,
required type of certification: EASA, Annex I type etc.
The manufacturers of the new aircrafts with built-in FES system, determine the final price of FES system themselves!