Yea, so there are 2 items in play:
1. The optronics module
2. The shell helmet
The PAF will acquire 1 optronics module per fighter (just like how there's a JHMCS for each F-16). Obviously, this is the costliest part of the HMD/S. I think the Chinese HMD/S may cost more than the JHMCS because it's a more advanced stack. IIRC the JHMCS is a monocular system, while the Chinese HMD/S seems to leverage a visor-based display (like the BAE Striker II).
The shell helmet is a continuous procurement run. This is custom-fit for every pilot. I think it'll basically start supplanting the PAF's Gentex HGU orders over the long term. In fact, it wouldn't surprise me if Gentex itself pivots a bit and starts offering custom-fit shell helmets. Most air forces now are moving towards the Striker-II-style HMD/S, including the F-35. Gentex basically needs the measurements and spec of how the optronics module would fit to make custom helmets. The custom-fit aspect would make these helmets cost more than a standard HGU.