Pricing variables.
1. Sizing service
2. Size/Complexity of design/model
3. Degree of Completion. Raw Print (to self paint) / sanded and primed / Painted and sealed
4. Internal padding for wear
5. Lens or lenses Installed
Also being taken into account would be whether its just a purchase for display or would it need to be sized to provide a good fit for costume or cosplay use. This and deciding the final form is all negotiable focusing on meeting your wants and needs.
Example: Raw Mandalorian and a Finished Stormtrooper.
The fine example on the left is from the Galactic Armory